Name: Type: Doorbells Power Source: Battery,DC Doorbell Type: Wireless Remote Range: 200 meters in open area Applicable Space: Home/Office/Villa/Hotel/Hospital/Apartment Volume:3 levels Ringtones:38 pcs Waterproof grade: IP44 The doorbell can use in office,home, hospital,factory,restaurant or any where you need it. 200 meter receiving distance (In the open area),Stable quality is perfect for villas, hotels, schools and other areas. The chiming receiver unit can be free standing or wall mounted using the included hardware, install the push button with provided double sided tape or screw it to the wall (screws are included). The button cannot be placed on an iron door because it will interfere with the signal. colour:Silver 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.