FORRINX Portable Wireless Doorbell Kit with IP44 Waterproof Transmitter and with 52Chimes Fireproof Receiver, No Batteries Required for Receiver,Remote Operating Over 900 Feet in Open Air Transmitter and receiver can operate at a range of over 900feet(Over 1000 Feet in the Open Air) 52 oft-recounted chimes make you every day a different one if you want. Volume: 4 levels Volume adjustable from 30db to 110db Portable transmitter is waterproof IP44,with very low power consumption, and battery is changeable, its very convenient. Indicator of LED. 2different way for installation, double-side sticker or screws. Receiver cube can be installed easily with plug, and no batteries needed. Package includes 1*plug-in receiver unit and 1*remote transmitter push button,1*User Manual, 2*anchors and screws, 1*screw driver, 1*12v 23A battery for remote transmitter