[Out of the Box] This door chime has been paired before delivery. No need for wiring or electrician installation: simply plug the receiver into the socket, and glue the door sensor to the door with the provided double-sided adhesive, and you're ready to go.
[Longer Range] Up to 1000 Feet in the OPEN AIR from the sensor (300 ft if there are walls). Cover your house or store, ensures you will never miss a visitor. Include one 23A 12V battery in equipment and design of Ultra-Low-Power, the battery can easily last 1-3 years.
[Multiple Features] The door sensor chime is equipped with 60 different chime options and 5-level of volume range from 0dB to 110dB, so you can create a comfortable environment for your family. Silent mode with just LED flash is available when you don't want to be disturbed.
[Sensor upgrade] In order to avoid battery consumption during storage and transportation, we added a power button on the sensor, if not used for a long time, please turn off the sensor to extend the battery life.
[Distinguish Front and Rear Doors] All receivers will ring no matter which door is opened, but each door has a different tone, so you know where your guests are. If you want the sensor and receiver to work one-to-one, please try the steps in "How to clear the frequency and re-pair".