Usage Tips: The plug-in chime activates when a visitor presses the smart doorbell. This plug-in chime is designed to work with a smart doorbell to enhance home security. Features: - 433MHz frequency, compatible with wireless video doorbells - Plug-in design for easy indoor use - Adjustable volume with mute option, up to 110dB - Multiple melody options to choose from - One chime can pair with multiple doorbells; one doorbell can pair with multiple chimes Note: Size and color may vary slightly due to manual measurement and lighting conditions. Actual product may differ slightly. Specifications: - Color: Black / White (Optional) - Material: Plastic - Plug: UK - Voltage: AC 90–250V - Frequency: 433MHz - Power Consumption: 10mW - Volume: Adjustable, up to 110dB - Music Selection: Supported - Chime Size (plug not included): 73 x 73 x 32mm / 2.9 x 2.9 x 1.3in - Package Size: 8 x 8 x 5.5cm / 3.1 x 3.1 x 2.2in - Package Weight: 75g / 2.6oz Package List: - 1 x Plug-in Chime - 1 x User Manual (English)