Wireless Indoor Chime For V7 V6 V5 M3 Wifi Doorbell Receiver Ding Dong

Product features: Stylish appearance with light touch design Easy and convenient installation Ultra Low-power electronics, power saving and durable use 52 polyphonic ringtones optional 4-level optional volume adjustment technical parameter Working voltage AC 90~250V Working frequency 433.92 MHz+-280 KHz Power consumption 10 mW Transmission power 0dbm Sensitivity -110dbm net weight 92G Volume 10-110db Size 81 * 81 * 20mm The indoor Dingdong machine is directly plugged into the socket at home and does not require a battery. Its function is that when the outdoor doorbell rings, the tinkling machine on the door will sound. The matching is achieved through the matching code between the doorbell and Dingdong, just like the Bluetooth function of the phone