Features: 1. Provides robust anti-interference performance and one-to-one signal pairing, ensuring reliable connection. You won't miss any visitors even in a large house with multiple rooms when the doorbell rings. 2. LOUD ENOUGH DOORBELL FOR ANYWHERE – Adjustable volume with mute mode, 38 selectable melodies, and 4 adjustable volume levels. 3. WEATHER-RESISTANT AND ENERGY-SAVING – The doorbell is made of plastic, offering good fire and flame resistance, along with IP44-rated waterproof and dust-proof protection. Suitable for both indoor and outdoor use in various weather conditions including cold winters and hot summers. 4. EASY TO INSTALL – Simply mount the wireless doorbell button to your door frame using screws or double-sided tape, and plug the receiver into a standard power outlet to begin using the chime immediately. Transmitter: 70mm x 40mm x 11mm Working temperature: -20°C to +60°C Battery: CR2032 (battery not included) Waterproof rating: IP44 Receiver: 95mm x 52mm x 32mm Operating voltage: AC 100–250V, 50/60Hz Working frequency: 433.92MHz Standby power consumption: 0.25W Music: 38 songs Volume: 4 levels (including mute) Controllable volume range: 0–90dB (This data is based on open-field laboratory testing; actual performance may vary depending on environment and obstacles.) Receiving distance: Up to 200 meters Receiver operating temperature: -10°C to +45°C Plug Type: US Plug (compatible with outlets in Canada, India, Mexico, Thailand, Philippines, Taiwan, and other regions) Voltage: AC 110V Color: White Material: Plastic Package Contents: 1 x Transmitter (battery not included) 1 x Receiver Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting effects and display settings may cause slight color variations between the product image and the actual item. Measurement error allowance: +/- 1–3 cm.