1Wireless Receiving: Our doorbell adopts wireless receiving technology, the doorbell host and the doorbell button can wirelessly pair the code with high receiving sensitivity and stable signal. 2Volume Adjustment: Using high capacity voice processing technology can accommodate 36 pieces of music, the volume has eight adjustable gears to meet the sound needs of different environments. 3ABS Shell: The doorbell is made of ABS material with high performance of fire and flame retardant, easy to install and simple to operate. 4Low Power Consumption: The transmitter does not consume power if it is not pressed, which is super power saving and supports long lasting use. 5Memory Function: The doorbell will remember the volume and selected music before the power is dropped, so you don't have to worry about losing the information. Item Type: Wireless Doorbell Material: ABS Working Voltage: US plug AC110-240V Wireless Frequency: 433MHZ Coding Mode: 1527, 330K Applicable Temperature: -20-55 Applicable Humidity: 40%-80%RH Working Distance: 100m in the open Doorbell Button Battery: 1 x 3V 220MAH button battery CR2032 Remote control code matching: Long press the function button for 10S, the doorbell will ring the second sound, release the button, press the remote control button, the doorbell will ring the selected music while the LED light flashes, and exit the code pairing mode. The doorbell can learn up to 20 remote controls, if you learn 20 remote controls, then operate again to enter the learning mode will immediately exit the learning mode, you must operate to delete the remote control and learn again. Delete the remote control. Press and hold the function button for 15S, the doorbell will sound the fourth ding dong, release the button, the doorbell will sound the ding dong sound and the LED light will flash to indicate that all the learning remotes are deleted successfully and the default setting is restored: the selected music is two ding dong and the volume is 8 levels. 1 x Doorbell 1 x Doorbell Button 2 x Installation Screw 1 x Double Sided Adhesive Do not disassemble, repair or transform the product without permission, otherwise it may cause accidents and failures. Do not drop the product on the ground or hard objects to avoid strong impact, resulting in failure and damage. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.