Doorbells Wireless Remote 2 door bell Buttons and 3 Receivers | CoolqiyaIT'S DURABLE AND SAFETY FOR PEOPLE: Transmitter with super rating IP55 waterproof; CE, FCC, RoHS certified. SUPER LONG DISTANCE TRANSMISSION: Made of high precision electronic components, operates at a highest distance up to 1000ft. WIRELESS DOORBELL KIT: With 58 different ring tones; Four levels volume control. Transmitter allows you or visitors to leave message. EASY INSTALLATION: No batteries required for receiver, simply plug into power supply;