Long Wireless Range: Reliable transmission range of 250–300 meters ensures stable operation even in larger homes or offices. Strong signal penetration and anti-interference protocol avoid false triggers. 52 Chimes & Adjustable Volume: Choose from 52 pleasant melodies with 4 adjustable volume levels (0–110 dB). Includes mute mode for quiet environments or nighttime use. Weatherproof Design (IP44): The wireless doorbell button is IP44-rated, making it resistant to water and dust – works perfectly in rain, snow, or heat. LED Flash Notification: Built-in LED indicator flashes on both the transmitter and receivers – perfect for the hearing impaired or for use in noisy environments. Quick & Easy Installation: Plug the receivers into power outlets, and mount the button using double-sided adhesive or screws. No wiring required – install in just one minute! Product Specifications: Model: Wireless Doorbell Kit Frequency: 433MHz ± 0.5MHz Transmission Range: 250–300 meters (open space) Sound Options: 52 melodies Volume Levels: 4 adjustable levels (max. 110 dB) Water Resistance: IP44 (Transmitter only) LED Indicator: Yes (Flashes when doorbell rings) Material: ABS plastic Working Voltage (Receiver): AC 85–265V Transmitter Battery: 23A 12V (included) Plug Type: EU plug (can be localized for other markets if needed) Usage: Home, office, apartment, warehouse, elderly assistance Package Includes: 1x Wireless Doorbell Button (Transmitter) 2x Plug-in Chime Receivers 1x 23A 12V Battery (for transmitter) 1x Double-sided adhesive tape 1x User Manual