Item Name: Wireless Doorbell Music Selection: 36 Songs Working Range: 300M in a Straight Line on the Open Ground Features: Adjustable, Wireless, Strong Signal Transmitter: Press with Indicator Light to Light up Scope of Application: Office Buildings, Homes, Shops, Factories, etc Receiver: Plug in and the Bell will Ring and the Light will be on Gear Position: Four Gears Adjustable (can be Silent) Plug Type: US Plug, UK Plug, EU Plug Transmitter Battery: 1 x 12V23A Battery (Included) Receiver Voltage: AC110~240V Material : Plastic Battery : lithium battery no button Size Details: 9.1cm x 5.9cm x 2.5cm/3.58" x 2.32" x 0.98" (Approx.) Specifications: Made of high-quality plastic material, it is lightweight and durable to use. It is the wireless doorbell that is characterized by waterproof function, which enables it to be used normally in rainy days and highly humid environments. It is easy to install by yourself with no wiring required, which is money-saving and labor-saving, free moving. Its main advantages are long-distance transmission, strong penetrating power, strong signal penetrating power, which can be used in office buildings, home shops, factories and other occasions. Owing to built-in stereo speaker, this wireless doorbell can achieve clear sound to bring you excellent usage experience. The length of this product is 9.1cm, the width is 5.9cm and the height is 2.5cm. 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 Receiver 1 x Transmitter 1 x Double Side Sticker 2 x Screw 1 x Doorbell Sticker