Style: WHITE 1 Push Button(DC Transmitter) + 1 Door Chime(AC Receiver)It's the perfect doorbells that are fashionable and elegant with a modern look for any home setting. Installation Notes: 1.With a flat headed screwdriver fold open the bell push. According to the given polarity input an LR 23A (12V) alkaline battery .Clean the case first and paste the double sticker、 then put the transmitter on the wall or door. In order to make it work properly、the height should be >1.5m.2.Please do not install on the metal door/window.Buildings、walls and metal objects will shorten the range、and may interfere with its operation.3.The shorter distance(between transmitter and receiver)、the signal will be better. When the battery voltage or power is not enough、it will shorten the distance、 or misuse ring.4.Widely used: compatible with basement、garage、patio、office buildings、hotels、factories、avoid interference from similar equipment.Specifications:Wireless Range: Max. 200-300m in open spacesTunes: 36 selectable options Volume: 4 levels of adjustable sound volume (25db to 80db) Receiver Power: AC 90-260V Transmitter Power: 1 x 12V Alkaline Type A23 batteryPackage Includes:1 x Push Button (Transmitter) 1 x Plug in Chime (Receiver) 1 x Double-Sided Adhesive Tape 1 x 12V A23 Alkaline battery 1 x Screwdriver1 x User Manual