1. Use the industrys most stable music chip, load 36 chord ringtones, pleasant and wonderful. 2. The adjustable 8-level volume can meet the needs of different environments. 3. The doorbell has the function of power-off memory, which can remember the volume before power-off and the selected music. No need to worry about losing information. 4. Low-power design, ultra-power-saving and durable use. 5. Working Voltage: AC110-240V 6. Wireless Frequency: 433MHz 7. Coding Mode: 1527/330Kohm 8. Applicable Temperature: -20 ~ +55 Celsius Degrees 9. Applicable Humidity: 40% ~ 80%RH 10. Working Distance: 100m (100m Open)
