Features: Super penetrating power, good signal, and hundreds of meters of penetrating power in the long distance. 48 music changes, there is always one you like, press the button to adjust the volume, 6-speed adjustable. The transmitter is designed to be excellent, with IP44 waterproof design, beautiful and practical. User-friendly design, you can adjust the volume with a light press, 6-speed adjustable, quiet design, do not disturb your baby's sleep. Digital circuit design, multiple sets of equipment can also be without cross talk. Specifications: Condition: Brand New Material: ABS Color: White + Gray Size: Shown as Picture Plug Type: #US Plug, #UK Plug, #EU Plug(Optional) Voltage:100 - 240V Working range: 280M Volume selection: 6 species (adjustable to mute) Music selection: 48 bells (factory default dingdong) Power consumption: <0.5w Sensitivity: <-105dBm Scope of application: family, commercial residential areas, office buildings, hospitals, restaurants, factories, etc. Package List: 1 * Transmitter 1 * Receiver 1 * Double-sided Stickers 1 * Doorbell Reminder Sticker 1 * Instruction Manual 2 * Screws 2 * Expansion Tube 1、Super penetrating power, good signal, and hundreds of meters of penetrating power in the long distance. 2、48 music changes, there is always one you like, press the button to adjust the volume, 6-speed adjustable. 3、The transmitter is designed to be excellent, with IP44 waterproof design, beautiful and practical. 4、User-friendly design, you can adjust the volume with a light press, 6-speed adjustable, quiet design, do not disturb your baby's sleep. 5、Digital circuit design, multiple sets of equipment can also be without cross talk.