Self-power Wireless Doorbell WIFI Remote Setting

Specification : Material : Polycarbonate;  Color : White;  Receiver Voltage : AC 110-240V;  Frequency : 433.92 MHz;  Distance : 50m ( Outdoor );  Transmitting Frequency : 10dBm;  Pressing Power : About 700g;  Plug : US Plug;    Size  Transmitter : Φ67 x 19 mm;  Receiver : Φ68 x 31 mm;    Weight  Transmitter : 43g;  Receiver : 74g;  Package Includes :  1 x Doorbell Transmitter;  1 x Doorbell Receiver;  1 x Back Plate;  1 x User Manual;  1 x Indicator Sticker;   2 x Expansion Screw;