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Then You Need This Forrinx Wireless Doorbell Forrinx Wireless Doorbell Amazing Forrinx Wireless Doorbell! 300m wireless receive?distance， you can install the chime unit in your bedroom， balcony etc. No wiring design makes it simple to use and easy to install. Both push unit and chime unit will illuminate blue LED lights when pressed. Different numbers of push unit and chime unit are freely to mix and combine together as one system. It is perfect for home， office， or commercial buildings. Forrinx Wireless Doorbell - The doorbell?you?want most! Compact Size Forrinx H4 Wireless Doorbell Main Features: Forrinx Wireless Doorbell with 2 receivers300m remote control and 3 level volume control Built-in 52 elegant stereo music， special high fidelity music chords， selected from the world classical musicEasy to install and no electrical wires to installExcellent water resitant performance with rubber seal ringFlash light will be on when visitor presses the remote buttonLED indicator in both transmitter and receiverUnique appearance design， evoking an aesthetic feelingSuitable for home， office， or commercial buildings Receiver: Working voltage: 110 / 220VPower consumption: 0.5WSound volume: 25 - 110dBWorking frenquency: 433.92MHz + / - 200KSize: 8 x 8 x 3cm Transmitter: Working voltage: Less than or equal to 12VPower consumption: Less than 10mWPower source: 1 x 12V 23A alkaline battery ( not included )Size: 7 x 4.4 x 1.6cmClick the Operating Instruction to learn how to use it Specification:SpecificationType:PracticalBrand:ForrinxModel:Forrinx H4For:AllFunctions:Multi-functionsMaterial:ABS， Electronic ComponentsOccasion:Home， OfficeColor:BlackDimension and WeightProduct weight :0.139 kgPackage weight :0.260 kgPackage size (L x W x H) :17 x 13 x 9 cm / 6.68 x 5.11 x 3.54 inchesPackage contentsPackage contents:1 x Forrinx H4 Wireless Doorbell Receiver， 2 x Forrinx H4 Wireless Doorbell Transmitter， 2 x 3M Adhesive Sticker， 8 x Installation Kit， 2 x Sign Sticker， 1 x English Manual