Eholder Portable Wireless Doorbell Kit, 36 Chime Tones, 1000 ft / 300 m Range [1 Touch Button Operated Transmitter & 1 Plug-In Door Chime](Black) + a Cr2032 3 Volt Lithium Coin Battery HKNDM127 GENUINE Eholder PRODUCTS ,Don't buy fakes from unauthorized sellers. Doorbell kit of 1 transmitter and 1 receiver supports a wireless range of up to 1000 ft / 300 m Offers a total of 36 chime tones and 3 levels of adjustable sound volume plus a silent mode Door chime can be plugged into a standard electrical outlet in your home Door chime can be plugged into a standard electrical outlet in your home