Energy saving ,transmitter battery can be used for over 15months ,and the receiver batteries for at least 9months.

1,Iphone surface finishing ,black color available

2, Easy to install ,wire free ,battery operated

3.FCC ,CE and ROHS compliant

4,1million sets of auto-learning codes to avoid interference

5,While bady with silver plated frame

6,Energy saving ,transmitter battery can be used for over 15months ,and the receiver batteries for at least 9months.

 7,Music volume adjustable ;flash ,ring ,or flash+ring for function option .

8.Quiescent current ≤100μm,Tranmit power <100mW,

9.Sound potion :36 polyphone melodies.

Auto-learning Code wireless doorbell QH-823AC