1. 21 selectable chime options 2. Wireless transmission; easy installation and battery replacement 4. Transmitter uses a rechargeable battery (400mAh polymer) lasting over 6 months 5. Adjustable volume (4 levels) 6. Digital pairing prevents signal interference with neighbors 7. Volume: 85 dB (measured at 0.5 meters) 8. Suitable for shops, malls, supermarkets, convenience stores, specialty stores, etc. 9. Power supply: Type-C charging (Both the transmitter and receiver are rechargeable models.) 10. Power supply voltage: 220V 11. Ring Power consumption: 0.5W
