Cinbos Model B9 Wireless Doorbell, Waterproof Chime Kit, 1000 Feet Operating, LED Indicator, 4 Level Volume (2 transmitter + 1 receiver)
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<b>[Product Information]</b><br>
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<li>Working Distance: Wireless doorbell operated at 1000ft / 300m(e.g. villa having 5 floors). The signal can easily cross through metal doors or walls, but can not install transmitter on the metal, because built-in antenna can not close to metal.</li>
<li>Outdoor Use: The Transmitter is waterproof(level IP55), not afraid rainstorm, severe heat or cold, so perfect for outdoor use. CE, FCC, RoHS certified.</li>
<li>LED Flash: When the button is pressed, the transmitter and receiver flash at the same time with obvious brightness.</li>
<li>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.</li>
<li>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.</li>
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