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Product Specifications Doorbell Dimension: Receiver: 10.0*5.5*2.5cm/3.9*2.1*1.0in(L*W*H) Transmitter: 8.0*4.5*2.5cm/3.1*1.8*1.0in(L*W*H) Weight: 200g/0.4lb Material: ABS Wireless trasmission distance: 130m/427ft Working Conditions Transmitter operates at ambient temperature from -40℃ to 60℃. Receiver operates at ambient temperature from -10℃ to 40℃. Suitable Occasion Idea for home, office, factories, guest rooms in hotel, hospital, store, etc. How to Install and Use Autbye Doorbell Transmitter Installation Method: 1.Stick the double-side sticker onto the wall and on the back of transmitter. 2.Tear another side of tape paste the button on to the wall. Receiver Installation Method: 1.Plug the AC receiver into the standard socket where the room needs to be installed. 2.After successful installation can be used normally, press the transmitter then indoor receiver immediately receive the signal to play music and flash lights. Notice 1.Non professionals do not open their own maintenance, so as not to destroy the precision electronic components. 2.Avoid installing the units in the sunny places or close to other metal objects. 3.The correct use of this product can effectively extend the service life. 4.The actual use of remote control depending on the use of environmental factors to shorten interference. Package Included 1* Receiver 1* Transmitter 1* Double-sided Sticker Pad 100% Money Back Guarantee