Working Distance: Wireless doorbell operated at 1000ft / 300m(e.g. even applicable to some villa having 5 floors). The signal of this remote doorbell can easily cross through about 5~10 metal doors or walls.
Outdoor Use: The Transmitter is waterproof(level IP55), not afraid rainstorm, severe heat or cold, so perfect for outdoor use. CE, FCC, RoHS certified.
LED Flash: When the button is pressed, the transmitter and receiver flash at the same time with obvious brightness.
Sound Volume & tune: Vol can be set to 25db(no noisy class)-110db(loudest). You can make it be heard just at 2 meter when set to min-vol,or be heard pass through 3 floor when set to max-vol. It has 52 Chimes,include common ringtones or pleasant tunes.
It include 1 Receivers And 2 Transmitters, it working out of the box, and bears independent communication sign and enjoys with strong anti-interference ability and the function of false alarm prevention. By the way, the number of receiver and transmitter can be DIY, but must be various models that produced by CINBOS.