IdeaNext Wireless Doorbell Smart Home Digital Doorbell with 1 Remote Button Transmitter and 2 Plug-in Receivers Operating at 1000ft Range with 36 Chime Tones, No Battery Required for Receivers Plug and play. Easy to use and install. Just plug receiver into an electrical outlet (no battery required) Over 36 different ring tones. Operating range of 1000 feet in the open- air. Four levels adjustable volume. Unique and elegant design, 1 remote button transmitter and 2 plug-in receivers., you can hear ring anywhere of your home, on the second floor, garage, or basement etc.. Remote transmitter button is made of high quality ABS material, safe and environmental. Includes 1 remote button transmitter and 2 plug-in receivers, double side adhesive tape, screwdriver, battery not include.