XY-802 Smart Home Wireless Doorbell 433Hz Elderly Wireless Elderly and Patients Emergency Call Button, 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 batteries (12V 23A batteries, batteries not included), providing over 12 months of continuous use 4. Adjustable volume with 4 levels 5. Digital code pairing prevents crosstalk between neighbors 6. Receiver power consumption less than 0.5W 7. Volume 85 dB (tested at 0.5 meters) 8. Suitable for shops, shopping malls, supermarkets, convenience stores, specialty stores, etc. 9. Tested range of approximately 150 meters under unobstructed conditions