10 pcs Recessed Brown Door Contacts NC Security Alarm Door Window Sensors W/Magnetic Reed Switch. These ¾” Door Contact Position switches (DCS) Work with All Access Control and Burglar Alarm Systems auspowers_batchone 8V ✔Operating temperature:0～40 ℃ /

8V ✔Operating temperature:0～40 ℃ / 32～104℉ &45%-80%RH ✔Power source:1“9V” battery (included） USE-FRIENDLY DESIGN Sound & Light Alarm Green Light (Mute): Less than 4mGYellow Light (Low sound frequency): 4mG-40mGRed Light (High sound frequency): More than 40mG Comfortable Grip The body material is processed by a special process

5ft Packing: a car charging head

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10 pcs Recessed Brown Door Contacts NC Security Alarm Door Window Sensors W/Magnetic Reed Switch. These ¾” Door Contact Position switches (DCS) Work with All Access Control and Burglar Alarm Systems auspowers_batchone 8V ✔Operating temperature:0～40 ℃ /10 pcs Recessed Brown Door Contacts NC Security Alarm Door Window Sensors W Magnetic Reed Switch. These Door Contact Position switches (DCS) Work with All Access Control and Burglar Alarm Systems These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system. The door position switches operate with a built an internal magnetic reed switch that closes when