Waterproof Self Powered Wireless Door Bell Chime Doorbell Ringer BatterylessDescription: Waterproof Self Powered Wireless Door Bell (No Batteries, No Wires, No Hassle). Features: Self powered wireless doorbell. Signal can pass through doors, walls, floors etc. Outdoor distance is up to 100m. Indoor distance is up to 30m. Waterproof. 38 Ringtones. Adjustable volume. No need for any batteries for the transmitter nor for receiver. LED indicator on both transmitter & receiver. Transmitter service life is up to 200,000 presses.