XY-809 Smart Waterproof Home Wireless Doorbell Elderly Wireless Elderly and Patients Emergency Call Button Doorbell, Power Plug:US Plug(Black)

1. 38 preset chord progression tracks with selectable sound quality
2. Wireless transmission, easy installation, and convenient battery replacement
3. Transmitter uses 2032 button batteries, providing over 12 months of continuous use
4. Adjustable volume with 4 levels
5. Digital code pairing prevents crosstalk between neighbors
6. Volume 85 dB (tested at 0.5 meters)
7. Suitable for shops, shopping malls, supermarkets, convenience stores, specialty stores, etc.
8. Tested range of approximately 150 meters under unobstructed conditions
9. Receiver has flash and vibration functions.