HOOMIL Electric door bells,wireless doorbell,Self-Powered Wireless Doorbell，Model: 07,No battery required.IP67 waterproof rating. (Black1+1)

【Self-powered technology】Using micro-energy harvesting technology, useless batteries, light buttons, and worry-free battery life.

【Ringtone and volume】4-level volume, adjustable at will, the elderly can hear clearly. 38 ringtones, receiver music can be freely selected.

【IP67 Waterproof Rating】IP67 rated transmitter design, working temperature: -4℉-131℉, can withstand harsh weather conditions.

【Transmission distance】The transmission distance in the open space is 2300in, which can meet the use of various house types.

【Service life】Pressing force 200,000 times.