Description:Designed with built-in stereo speaker, this wireless doorbell can achieve clear sound to bring you excellent usage experience. It is easy to install by yourself with no wiring required, which is money-saving, labor-saving and free moving.Lots of appealing features have been integrated into this wireless doorbell such as self-powered outdoor unit, slim and mini design, beautiful appearance, eye-catching backlight, chime individual setting, ringtone memory function, electric reduction voltage, IP65 waterproof rating and so on.Made of high-quality ABS material, it is lightweight and durable to use.The length of the receiver is 6.7cm, the width is 5cm, and the height is 2.6cm. The length of the transmitter is 7cm, the width is 4.6cm, and the height is 2cm.It is suitable for office building, household, factories, tourism and other places, it has a wide range of uses.Item Name: Wireless DoorbellMaterial: ABSColor: Black, WhiteReceiver Power: Plug InReceiver Operating Voltage: AC 100V-230V 50/60HzReceiver Operating Current: 60mAReceiver Static Current: 7mAReceiver Power: 0.25WReceiver Plug: US Plug, EU Plug, UK PlugReceiver Ambient Temperature: -10 degrees Celsius to +45 degrees CelsiusTransmitter Power Supply: Self-poweredTransmitter Waterproof Rating: IP65Transmitter Ambient Temperature: -20 degrees Celsius to +60 degrees CelsiusWorking Distance: 150mFrequency: 433MHzMusic Tuning: 38 MusicSound Volume: 50db/1mVolume Adjustment: Level 4 (High, Medium, Low, Mute)Features: Self-powered, Waterproof, BacklightSize Details: Receiver: 6.7cm x 5cm x 2.6cm/2.64" x 1.97" x 1.02" (Approx.)Transmitter: 7cm x 4.6cm x 2cm/2.76" x 1.81" x 0.79" (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.Package Includes:1 x Receiver2 x Transmitter1 x User Manual