Name: Type: Doorbells Power Source: AC,Battery Doorbell Type: Wireless Remote Range: 300 meters in open area Waterproof Rated: IP44 Applicable Space: Home/Office/Villa/Hotel/Hospital/Apartment Melody:36 pcs Volume:4 levels Receiver Voltage:110-220V The doorbell can use in office,home, hospital,factory,restaurant or any where you need it. 300 meter receiving distance (In the open area),Stable quality is perfect for villas, hotels, schools and other areas. The button cannot be placed on an iron door because it will interfere with the signal. Just plug the receiver into an electrical outlet,the push button transmitter can be to the door with provided adhesive tapes. Plug Type: UK plug,it applies to Malaysia, the United Kingdom and so on. colour:black Material:plastic size:Transmitter: 77*46*20mm Receiver: 95*65*24mm Package Contents: 1*Doorbell transmitter 1*Doorbell receiver 1*Double sided tape 1*12 V 23A alkaline battery 1*Screw Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.