The plug-in chime activates when the smart doorbell is pressed. This indoor-use chime is designed to work with compatible wireless video doorbells to enhance home security.Features: - 433MHz frequency, compatible with wireless video doorbells - Plug-in design for easy setup, intended for indoor use only - Adjustable volume up to 110dB, with mute option - Multiple melody options to suit personal preferences - One chime can pair with multiple doorbells; one doorbell can connect to multiple chimes Note: Slight variations in size and color may occur due to manual measurement and lighting conditions. Actual product may vary slightly.Specifications: - Color: Black / White (Optional) - Material: Plastic - Plug: UK - Voltage: AC 90250V - Frequency: 433MHz - Power Consumption: 10mW - Volume: Adjustable, up to 110dB - Music Selection: Supported - Chime Size (excluding plug): 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)