128 optional Melodies ringtones, and 4 levels of adjustable volume. Convenient for you to choose them randomly. 2Support AC 100V-240V Voltage, 433.92MHZ Wireless frequency, easy and simple to install. 3The ringing flashing design, can provide much convenience for hearing impaired people. 4With strong signal and far transmission function. Up to 150 meters wireless range in open area, can reduce the influence of distance successfully. 5Waterproof and moisture proof function, can be installed anywhere and anytime, no worry about the bad weather.
