Waterproof touch doorbell button.Doorbell, alarm, welcome alarm all in one.38 songs optional, 4 levels adjustable volume.300 meter receiving distance (in the open area), stable quality is ideal for villas, hotels, schools and other areas.Type: Wireless DoorbellMaterial: PlasticModel: A10Operation Range: 300m in Open AreaMelody: 38PcsVolume: 4 Levels (20-85dB)Battery Type: 1 x 12V 23A Battery (Not Included)Power source: AC 100-240VPlug Type: US Plug, UK Plug, EU Plug (Optional)Features: Wireless, Waterproof, 4 Levels, Built-in MusicSize of Transmitter: 7.5cm x 5.1cm x 2cm/2.95" x 2.01" x 0.79" (Approx.)Size of Receiver: 9.5cm x 6.5cm x 2.4cm/3.74" x 2.56" x 0.94" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Transmitter1 x Receiver1 Bag of Screw1 x Double-sided Sticker1 x User Manual