Wireles doorbell (D8662)

*Frequency: 315MHz±0.5MHz,433MHz±0.5MHz
*Active pressure wave(receiver): ≤-57dbm
*Negative pressure wave(button): ≤-36dbm
*Power supply(receiver): 2×1.5V AAA
*Power supply(button): 1*12V 23A,Alkaline battery
*Working power consumption: ≤5W