433MHz Wireless Door/Window Magnetic Sensor for GSM Home Security Alarm Systems
$8.99
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Easy to install--just peel and stick Built-in omnidirectional antenna - The door/windows alarm with built-in antenna to strengthen the signal, make it more sensitive Can't work standalone - The door detector work with home alarm system,use as alarm accessories. Low-voltage reminder function - When wireless door sensor is in low voltage, it will flash light all the time to remind user change the batteries.
Easy to install--just peel and stick Built-in omnidirectional antenna - The door/windows alarm with built-in antenna to strengthen the signal, make it more sensitive Can't work standalone - The door detector work with home alarm system,use as alarm accessories. Low-voltage reminder function - When wireless door sensor is in low voltage, it will flash light all the time to remind user change the batteries.
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