Door Sensor, Wireless Door Alert Chime Kit for Home/Office/Store, Coolqiya Door Open Chime Alarm Entry Alert System Operating at 600 FT Range with 5 Volume Levels & 58 Melodies, LED Flash (Black);

Size for Receiver: 3.1*3.1*1 inch;Transmitter:3.4*1.25*0.67 inch
Working distance range: 900ft~1000ft (in an open air, no obstacles)
Receiver Power: AC 110V (US)
Transmitter Power: 1 x 12V Alkaline Type A23 battery (included)
Power consumption of receiver: <0.5W

Usage:
Commercial/Residential/Assisted Living (It can be used as paging devices for elderly care and nursing residents.)

How to set different ring tone?
1. Seclect the music you want by pressing "music control button" on receiver.
2. Then long press "volume button" on receiver for 5-7 seconds till you hear "ding" sound with blue light. And press transmitter button to pair with receiver within 5 seconds.
3. Finally you will hear the music you set.
4. Do the same way to pair other receivers with transmitters one by one.

Note:
If you have installed the transmitter on door frame, you need to use small screwdriver to take it of and take it close to receiver and pair them

What you get:
2 x Transmitters
1 x Receiver
4 x Screws & Anchors
1 x Screwdriver
2 x Double-Sided Adhesive Tape
2 x 12V A23 Alkaline battery for transmitter
1 x User Manual