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For any reason, if you are not satisfied with our products, we'll assist you till you're satisfied or make a full refund within two years. Please feedback with us, we will reply immediately.Your satisfaction is always our top priority.Simple to set up and pairing a transmitter to receiver with different ringtones. You can identify the direction and location of visitors through different ringtones.You'll have your new doorbell system ready to use in mere minutes!Pairing a transmitter to receiver:①Please select your favorite ringtone before pairing. ②Long press the volume control button for 5 seconds while press transmitter button to send a signal to receiver, then the pairing is successful. Remarks:Pairing mode will quit automatically after pairing is completed. And pairing mode will last for 5 seconds only.Easy to install①Use the double-sided adhesive 3M tape stick the transmitter and fixed on the wall.②put receiver in the socket.Specification- Working voltage of plug-in receiver: AC 110~240V - Wireless range: 300m/1000 feet( in the open air)- Selectable ringtones: 38 - Volume range: 25~85dB, 4 levels - Expandable (Yes or No): Yes- Working temperature: -22℉~158℉ Package included - Transmitter x2 pcs - Receiver x2 pcs - Screws & Anchors x 4 pcs - Screwdriver x1 pcs - Double-Sided Adhesive Tape x2 pcs - User Manual x1pcs