This wireless door bell kit consists of 1 waterproof push button transmitter and 1 plug in receiver. The push button transmitter triggers the receiver wirelessly, without the need of any connecting wires. Modern and Security design, the wireless doorbell operated at 1000ft/183m in open area, perfect for townhouse, home, office. You can hear rings from several rooms away when someone rings the bell. The user can define the chime and the volume level. The volume is loud enough that you won't miss a visitor anymore. Premium quality and stability, the excellent materials keeps itself from getting higher temperature and interference. The transmitter is rated IP47 waterproof so that the bell perform extraordinary outside the house.Stable transmission signal.Each waterproof push-button transmitter has its independent ID to avoid interference with other transmitters. Adjustable volume/chimes User can adjust the volume and choose his/her favorite ringtones. This wireless door bell system also allows the user to set up different chimes for each receiver. This wireless doorbell is a smart selection for everyday use. Energy saving design The 12V23A Alkaline battery in a transmitter lasts for as long as 3 years, while the plug-in receivers consume less than 1 Watt in 1 year. Specifications: Range:500-1000ft/300m ( in the open air) Chimes: 52 options Volume: 4 adjustable levels (25db to 110db) Package include: 1¡ÁUser Manual 1¡ÁWaterproof push-button Transmitter 1¡ÁPlug-in Receiver 1¡Ásmall battery (not rechargeable) 2¡Áscrew 1¡Ádouble-sided adhesive Note: The push button requires a battery which is already included, it is not rechargeable. And the receiver plug into to the wall and requires no battery.