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System sensor srl fire - fire, alarm

System sensor srl fire - fire, alarm

$23.95
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System sensor spectralert - system,

System sensor spectralert - system,

$325.00
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System sensor d4120w duct - d4120w,

System sensor d4120w duct - d4120w,

$99.99
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System sensor cosmo - sensor, cosmo-2w

System sensor cosmo - sensor, cosmo-2w

$30.50
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System sensor p2r horn strobe - p2r, horn/strobe

System sensor p2r horn strobe - p2r, horn/strobe

$29.99
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System sensor spectralert - system,

System sensor spectralert - system,

$30.00
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System sensor ch24mcw - system, fire

System sensor ch24mcw - system, fire

$74.99
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System sensor p2rl wire - system, horn

System sensor p2rl wire - system, horn

$45.00
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Spscrl system sensor red fire - system,

Spscrl system sensor red fire - system,

$19.95
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System sensor p24110 wall - ,

System sensor p24110 wall - ,

$10.00
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System sensor p2w - 3),

System sensor p2w - 3),

$40.00
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System sensor two wire - system,

System sensor two wire - system,

$40.00
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System sensor pc2wl - sensor,

System sensor pc2wl - sensor,

$42.50
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System sensor innovair d4120 - system,

System sensor innovair d4120 - system,

$95.00
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System sensor d4120w - sensor,

System sensor d4120w - sensor,

$105.00
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System sensor rts151 - rts151, remote

System sensor rts151 - rts151, remote

$20.00
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System sensor b300 - system,

System sensor b300 - system,

$6.72
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System sensor p2grkled compact - system,

System sensor p2grkled compact - system,

$69.99
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New system sensor scrl strobe - sensor,

New system sensor scrl strobe - sensor,

$19.99
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System sensor co1224t 24v - system,

System sensor co1224t 24v - system,

$49.99
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System sensor srl fire - sensor, alarm

System sensor srl fire - sensor, alarm

$25.00
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System sensor p2rl wire - 2,

System sensor p2rl wire - 2,

$39.99
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System sensor pc2rl - pc2rl, fire

System sensor pc2rl - pc2rl, fire

$23.99
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System sensor 2 wire - sensor, i3

System sensor 2 wire - sensor, i3

$48.00
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System sensor speaker strobe - system,

System sensor speaker strobe - system,

$38.00
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System sensor swled - system, wall

System sensor swled - system, wall

$29.99
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New system sensor ps412 - ps412, fire

New system sensor ps412 - ps412, fire

$13.95
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New system sensor rts151key - 1,

New system sensor rts151key - 1,

$39.99
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System sensor hwl - system, hwl-lf

System sensor hwl - system, hwl-lf

$397.00
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System sensor 2151 - system,

System sensor 2151 - system,

$56.50
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System sensor cosmod2w - sensor, i4

System sensor cosmod2w - sensor, i4

$39.50
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System sensor pc2rl wire - system,

System sensor pc2rl wire - system,

$45.00
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System sensor 5601p heat - system,

System sensor 5601p heat - system,

$19.95
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System sensor spscr fire - sensor,

System sensor spscr fire - sensor,

$21.95
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System sensor spswk - system,

System sensor spswk - system,

$40.00
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System sensor co1224t 24v - system,

System sensor co1224t 24v - system,

$49.98
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Lot system sensor 2w - of,

Lot system sensor 2w - of,

$130.00
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System sensor d4120 - sensor,

System sensor d4120 - sensor,

$109.99
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System sensor innovairflex - sensor,

System sensor innovairflex - sensor,

$111.99
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System sensor cosmo wire - system,

System sensor cosmo wire - system,

$82.65
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System sensor d4120 duct - sensor,

System sensor d4120 duct - sensor,

$80.00
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System sensor b114lpbt sounder - sensor,

System sensor b114lpbt sounder - sensor,

$53.99
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System sensor spswl fire - system,

System sensor spswl fire - system,

$19.95
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System sensor spsrl - system,

System sensor spsrl - system,

$24.95
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System sensor spsrl - sensor,

System sensor spsrl - sensor,

$24.95
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Honeywell system sensor - ,

Honeywell system sensor - ,

$55.00
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System sensor pc24177 fire - pc24177,

System sensor pc24177 fire - pc24177,

$22.95
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System sensor p2rl - system,

System sensor p2rl - system,

$20.99
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System sensor sc24177 - sensor, fire

System sensor sc24177 - sensor, fire

$13.46
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System sensor chscwl - system,

System sensor chscwl - system,

$60.00
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System sensor spscwk - system,

System sensor spscwk - system,

$40.00
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System sensor rts451key - system,

System sensor rts451key - system,

$29.99
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System sensor pc2rled red - sensor,

System sensor pc2rled red - sensor,

$49.99
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System sensor spscwl - sensor, spscwl-clr-alert

System sensor spscwl - sensor, spscwl-clr-alert

$17.00
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System sensor horn white - hw,

System sensor horn white - hw,

$31.95
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System sensor pc2wl - pc2wl, ceiling

System sensor pc2wl - pc2wl, ceiling

$20.69
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New system sensor spscwl - system,

New system sensor spscwl - system,

$34.99
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System sensor spswl wall mount - wall,

System sensor spswl wall mount - wall,

$29.99
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System sensor p2wl - fire, alarm

System sensor p2wl - fire, alarm

$45.99
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System sensor swl - system, alarm

System sensor swl - system, alarm

$27.87
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Spectralert advance fire - advance,

Spectralert advance fire - advance,

$23.00
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Duct smoke detector - detector,

Duct smoke detector - detector,

$20.00
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System sensor series 4wta - system, 4wta-b

System sensor series 4wta - system, 4wta-b

$33.00
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System sensor i3 series - sensor,

System sensor i3 series - sensor,

$50.00
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System sensor multi alert - system, ss24

System sensor multi alert - system, ss24

$28.99
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System sensor rts151 remote - system,

System sensor rts151 remote - system,

$25.00
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System sensor hrl - fire, alarm

System sensor hrl - fire, alarm

$18.95
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System sensor p2rk horn - system,

System sensor p2rk horn - system,

$180.00
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System sensor 2wt - system, 2-wire

System sensor 2wt - system, 2-wire

$47.00
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System sensor spsrl wall mount - spsrl,

System sensor spsrl wall mount - spsrl,

$40.00
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System sensor spsrl - system,

System sensor spsrl - system,

$38.50
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System sensor b300 detector - system,

System sensor b300 detector - system,

$9.99
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New system sensor - new!!,

New system sensor - new!!,

$39.95
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System sensor sp2r1224mc fire - sp2r1224mc,

System sensor sp2r1224mc fire - sp2r1224mc,

$25.99
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System sensor spscrl - system, fire

System sensor spscrl - system, fire

$19.95
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System sensor spw wall - sensor, speaker

System sensor spw wall - sensor, speaker

$15.31
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System sensor b200sr - sensor,

System sensor b200sr - sensor,

$48.51
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System sensor hgwl2 sounder - hgwl2-lf,

System sensor hgwl2 sounder - hgwl2-lf,

$46.15
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System sensor mdl spectralert - mdl,

System sensor mdl spectralert - mdl,

$30.00
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System sensor series - system,

System sensor series - system,

$45.25
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System sensor swl fire alarm - system,

System sensor swl fire alarm - system,

$22.95
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New replacement base plate for - new,

New replacement base plate for - new,

$19.95
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System sensor b200sr - system, b200sr-wh

System sensor b200sr - system, b200sr-wh

$10.50
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System sensor b - system, 2w-b

System sensor b - system, 2w-b

$40.00
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System sensor s1224mc strobe - sensor,

System sensor s1224mc strobe - sensor,

$12.00
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System sensor p2gwl - system,

System sensor p2gwl - system,

$35.34
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System sensor 5601 fire alarm - system,

System sensor 5601 fire alarm - system,

$8.37
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System sensor scwled fire - sensor,

System sensor scwled fire - sensor,

$39.95
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System sensor spsrled fire - system,

System sensor spsrled fire - system,

$39.95
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System sensor sgrkled - system,

System sensor sgrkled - system,

$59.99
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System sensor sprk - system,

System sensor sprk - system,

$40.00
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System sensor b114lpbt - sensor, fire

System sensor b114lpbt - sensor, fire

$44.95
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System sensor spscr speaker - sensor,

System sensor spscr speaker - sensor,

$22.50
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System sensor spectralert - sensor,

System sensor spectralert - sensor,

$15.00
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System sensor beamlrk long - beamlrk,

System sensor beamlrk long - beamlrk,

$52.20
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New system sensor - new,

New system sensor - new,

$49.95
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📊96 listings · from $6.72 · avg $47.35

Browse 96 system sensor listings currently in our index. Prices range from $6.72 to $397, with an average of $47.35. Whether you are hunting for a bargain or looking for a top-spec model, the selection below covers all price points — new, used and refurbished. More about system sensor →

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Everything you need to know about system sensor

Whether you are looking for a brand-new or second-hand system sensor, eBay offers one of the largest selections available online. With 96 active listings at the time of this page's last update, you have plenty of choice across different conditions, sellers and price points. The cheapest option currently starts at $6.72, while premium listings can reach $397 — giving you a wide budget spread to work with. The average price of $47.35 can serve as a useful benchmark: listings below this tend to be used or auction-style, while those above often include extra accessories, warranties, or are sold by professional sellers with high feedback scores. Always check the seller's feedback rating and return policy before committing to a purchase. If you need the item quickly, filter by "Buy It Now" to avoid the uncertainty of auctions. For used items, look closely at the condition description and photos — terms like "good", "very good" and "like new" can mean very different things depending on the seller.

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