AVANTEK Wireless Doorbell, D-3W Waterproof Door Chime Kit Operating at over 1300 Feet with 2 Plug-In Receivers, 52 Melodies, CD Quality Sound and LED Flash

HIGH PERFORMANCE TRANSMITTER: Ultra-low power consumption; uses a lithium battery that boasts 3 year maximum lifespan; IP55 dustproof and waterproof; working temperature ranges from -4 °F-140 °F; withstands various harsh weather conditions