Doorbell Wireless Door Bell Chime Waterproof Doorbell 1 Plugin Receivers 200M Long Range Waterproof-Door Chime-Weatherproof Elderly Pager Features: Wireless doorbell kit: Includes everything necessary for DIY installation - 1 outdoor remote doorbell transmitter and 1 intelligent doorbell receiver, double-sided adhesive tape, and screws. Press your finger to electricity, and self electricity without using a battery: once you press your finger, the energy will be converted into electric energy, and you will no longer need to worry about changing the battery for the doorbell when sending wireless signals. Not the doorbell, but also the pager: the elderly, children and pregnant women have needs, so they can when to press it and sleep at night. Rainproof design: not afraid of sun and rain, daily sun protection and rain protection. Versatility: Our wireless doorbell is suitable for any occasion - apartments, townhouses, small businesses, warehouses, offices, and apartment properties. Whether you use it outdoors as your front and rear fences, in your mailbox, or indoors as a teacher, seeking helpful classroom organization and management Product Volume: 0-110 dB, adjust in three gears Model distance: 200 meters in the open without interference Temperature: - 20 C~50 C Ringtones: 38 chords Receiver: 110-240V, 50/60Hz Wireless frequency: 433MHZ Package: 1 * Key 1 * Ring