10-level dimming to meet the light requirements of plants and pets. Turning lights on and off gradually reduces the impact on fish. Time switch function combines timer and dimmer in one device. Suitable for most fish tank lights with input and output of 12-24V. Adaptation voltage: 12-24V. Applicable power range: 3-100W. Single-channel lamp support. Product connector: 5.5mm DC male with lock thread. Functions: timing control, four sunrise and sunset simulation modes, ten-level brightness adjustment.Note: This aquarium lamp timer is not suitable for saltwater aquariums. Do not use with AC (alternating current) power sources. Do not exceed the specified voltage and power during use. Input voltage: 12V - 24V. Output voltage: 12V - 24V. Power: 50W - 100W.To set current time: Press R key and on/off key simultaneously for 2 seconds, then use +/- buttons to adjust. Do not exceed the recommended voltage and power range.Important safety notes: The timer is not waterproof; keep away from water and damp locations. Ensure working voltage matches the timer specifications. Never touch the device with wet hands. Turn off power before maintenance. If the product is not functioning properly, have it repaired by a professional. If the product falls into water, immediately disconnect power and dry in a cool place. Avoid direct sunlight exposure. This product is not a toy; keep out of reach of children. For questions, contact seller.Color: Black. Material: Plastic. Package contents: 1 x LED Light Dimmer Controller. No other items included. Note: Lighting and display differences may cause slight color variation between image and actual item. Measurement error allowed: +/- 1-3cm.