AC110-250V Plug-in Wireless Door Bell Waterproof Avoid Battery Button Doorbell With LED Light

This order Doorbell Transmitter (button) Doorbell Receiver Additional 3M double-sided adhesive pad Parameters: Working Frequency: 433 MHz Transmitter is powered by itself. (No need battery) Power supplier of receiver:  (AC 110-250V) Volume: 4 levels adjustable. (max 105 dB) Transmitter button working environment: -40 C - 60 C. Features: Creative Technology, No Need Battery. Wireless doorbell, wireless distance is up to 100 m in open area. Transmitter service life is up to 200000 times pressing. Selectable ringtones. LED indicator on both transmitter and receiver. Special shape and nice appearance.