Description:What this wireless doorbell can offer you are 3 levels volume adjustment and 38 music, so it can be adjusted freely to meet your needs for different occasions. You can install and use it easily.This wireless doorbell can achieve clear sound to bring you excellent usage experience due to its built-in dual speaker.Made of high-quality ABS material, it is free of mercury, lead and ultraviolet light, durable and eco-friendly.The length of the receiver is 8cm, the width is 7.6cm, and the height is 3.3cm. The length of the transmitter is 8cm, the width is 5.9cm, and the height is 4.5cm.It is suitable for home, office, factory, shop, restaurant, hotel, etc. The transmitter should be installed at a height of about 2 meters, and the receiver can be used simply by plugging in the power.Item Name: Wireless DoorbellMaterial: ABSColor: WhiteStyle: US Plug, EU PlugReceiver Power: Plug InReceiver Operating Voltage: 110-240VTransmitter Power Supply: 3 x AAA Battery(Not Included), USB ChargingTransmitter Operating Voltage: 4.5VWorking Distance: 70 MetersTransmitter Sensing Distance: 3-7mVolume Adjustment: High, Medium And LowMusic Tuning: 38 Pieces Of MusicFeatures: Clear Sound, Entry Alarm, AdjustableSize Details: Receiver: 8cm x 7.6cm x 3.3cm/3.15" x 2.99" x 1.3" (Approx.)Transmitter: 8cm x 5.9cm x 4.5cm/3.15" x 2.32" x 1.77" (Approx.)Notes: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.Instructions:1. Plug the receiver into the socket and power on, open the battery cover of the detector and insert the battery.2. Put the rotating bracket into the back of the detector and jam.3. Push the detector switch to the ON position, and wait for 10 seconds for the self-checking time to enter the normal working state.Receiver Button:1. Music: 38 pieces of music are optional, and the music logo button on the side can be adjusted.2. Volume: three levels of volume adjustment (high, medium, low) side volume sign button to adjust.3. Sound and Silent: sound: sound + indicator light, silent: indicator light.Package Includes:1 x Receiver2 x Transmitter 1 x User Manual