Main features:

Designed for the blind ,hearing impaired and senior care.

Great for noisy environments where the doorbell can't be heard.

52 ringtones to choose from and 4 steps volume control(25~110dB).

Up to 1000 foot operating range between receiver and transmitter. 

Approved with CE,FCC,RoHS certification.

Specifications:

Operating voltage of vibrating receiver: DC 3V(2*AAA battery)

Operating voltage of transmitter:DC 12V(1*23A battery)

Wireless Range:1000FT in the Open Air; 100~500 ft with doors and walls

Selectable Ringtone: 52 Options

Volume Range: 4 Levels (up to 110 dB)

Working Frequency: 433.92 MHz±280KHz

Working Temperature: -30℃~70℃