Etekcity Wireless Doorbell Kit: 1 Plug-in Door Chime Receiver, 1 Remote Push Button Transmitter (328 Feet, 48 Chimes) CUSTOM CHIME: Hear a visitor's arrival from rooms away with a wireless range of up to 328 ft., 4 lev OUTDOOR-FRIENDLY : Built with IP33 to withstand most weather (dirt, dust, and water) rain or shine VISUAL ALERT: Receiver includes a bright blue LED visual alert for the hearing impaired CUSTOM EXPANSION: Pair systems across added transmitters and receivers. Select different sounds for different entrances 1 - Year Warranty; FCC, Rohs and CE certified