Portable Wireless Doorbell Chime Kit Operating at Over 1000 Feet Range 52 Selectable Melodies, No Batteries Required for Receiver - Black / White A classic square design with combination of black and white color. Our 25 years of Research & development experience in the area of wireless doorbell with CE, FCC & ROHS certifications are enough to win your trust. Premium quality; (Super long range wireless transmission, ultra strong penetration, signal stability, operating range up to 300 meters-1000 feet open areas). Transmitter with super rating IP44 waterproof, can be installed outdoor. The transparent compartment at the bottom of the transmitter allows visitors to leave message for you. 52 different ring tone for your selection; High quality and rotary acoustic fidelity, built-in stereo speakers with sound melody. Farewell to the invariable doorbell era, fashion pop, classic,make the ringtone vibe with your mood. Level 4 volume 25 dB to 110 dB adjustable, find the volume control button on the left side of receiver, press this button repeatedly to get desired volume level. Easy installation, Flexible apply, plug the receiver into a power outlet (no batteries required for main receiver) and the transmitter through screws or double sided tape.