300m remote control range, with 36 ringtones and 4 levels of volume to meet your needs for different occasions Comes with the receiver, will not interfere with other equipment in your home or those of your neighbors, ensures that you will never miss any visitors, even if you are several rooms away Convenient and easy-to-use design for a better user experience Simply plug the bell into the socket and remove the tape from the sensor to attach it to the door frame Waterproof design, suitable for use in homes, offices, stores, and more Specifications: Transmitter: includes indicator light, press the button to turn on Receiver: plug and play, activates sound and light when triggered Music options: 36 selectable melodies Volume: 4 adjustable levels (including silent mode) Transmitter power supply: 1 x 12V 23A battery (battery not included) Receiver power supply: AC 110V-220V Application areas: offices, homes, stores, factories, and similar environments