Smart learning mode User-friendly design Strong signal – Can penetrate 3-4 walls with a wireless range of up to 150 meters in open areas, ideal for large homes, apartments, offices, shops, and warehouses IP68 waterproof rating – Suitable for use in rainy conditions, safe and durable 38-home welcome door chime melodies – Doorbell can be muted during sleep Functions as both a doorbell and a pager – When elderly individuals, babies, or pregnant women need assistance while sleeping, pressing the transmitter will activate the receiver Note: This product is sold as a set. The receiver and transmitter must be used together and require pairing. Purchasing components separately may result in compatibility issues The transmitter should not be installed directly on iron doors, as metal may block the signal. It is recommended to place the transmitter adjacent to the iron door Power consumption: 0.25W Wireless frequency: 433 MHz Operating temperature: -10°C to +45°C Ringtone volume: Greater than 50dB at 1 meter Transmitter: No battery required Wireless range: 150 meters (open space) Plug type: EU plug, compatible with countries including Germany, France, Spain, Italy, and Indonesia Voltage: AC 100–240V Color: White Material: Plastic Dimensions: Receiver: 95 x 54 x 68 mm Transmitter: 80 x 50 x 28 mm Package contents: 1 x Transmitter button 1 x Receiver Note: Other items shown in images are not included Due to lighting effects and monitor settings, the actual color of the item may vary slightly from images Measurement tolerance: ±1–3 cm