The plug-in chime activates when a visitor presses the smart doorbell. It is designed to work with compatible wireless video doorbells and enhances home security. Features: - 433MHz frequency, compatible with select wireless video doorbells - Plug-in design compatible with easy indoor installation - Adjustable volume, from low to mute, up to 110 dB - Multiple melody options - One chime can pair with multiple doorbells; one doorbell can pair with multiple chimes Note: Slight variations in size or color may occur due to manual measurement or lighting conditions. Actual product takes precedence. Specifications: - Color: Black or White (selectable) - Material: Plastic - Plug type: UK - Input voltage: AC 90–250 V - Frequency: 433 MHz - Power consumption: 10 mW - Volume: Adjustable, up to 110 dB - Melody selection: Supported - Chime dimensions (excluding plug): 73 × 73 × 32 mm (2.9 × 2.9 × 1.3 in) - Package dimensions: 8 × 8 × 5.5 cm (3.1 × 3.1 × 2.2 in) - Package weight: 75 g (2.6 oz) Package includes: - 1 × Plug-in chime - 1 × English user manual