Product: Door Sensor Chime Alarm Wireless System for Home Security, Coolqiya Entry Bell Alert Kit 600FT Operating Range With 4 Volume Levels, 2 Door Sensors + 1 Plug-in Receiver(White)
Brand: Coolqiya
Color: White
How to set the tone and have it stay (How to pair door sensor to receiver)? 
 1. Pick the desired sound; 
 2. press and hold the volume button of the receiver for 5 seconds till it blink with "ding" sound, and then separate two stripes of door sensor to activate the receiver. You will hear the receiver ring the sound you selected, that means you paired them successfully.
【600 FT in OPEN AREA RANGE】- 52 Ringtones & 4 Level Volume (25 dB to 110 dB) to Adjust.
【How Does Door Sensor Alarm Kit Works?】- Attach 2 sections of sensor to a door/window frame. When you open the door, it will trigger the alarm unit and ring.
【Wireless Door Entry Chime Alert System】- Will Keep track of your little children, use for home to alert you when someone open the door; Also use for garage/office/retail store.
【Easy To Install & Expand】- Simply get the bell plugged into socket and Tear off the double-sided tape of the sensor and stick it on the door frame. You can add extra 20 receivers/transmitters.
Friendly customer service in 24hrs to make sure your 100% satisfaction, we offer refund or replacement for the unsatisfied products within 12 months of delivery.

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