10-level dimming to meet the light requirements of plants and pets. Turning lights on and off gradually reduces impact on fish. Time switch combines timer and dimmer functions. 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 compatible. Product connector: 5.5mm DC male with lock thread. Functions: timing, four sunrise and sunset 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 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 +/- keys to adjust. The timer is not waterproof; keep away from water and damp locations. Working voltage must match timer specifications. Do not touch with wet hands. Turn off power before maintenance. If not operating normally, have it repaired by a professional. If product falls into water, immediately turn off power and dry in a cool place. Avoid direct sunlight exposure. This product is not a toy; keep out of reach of children. Color: Black. Material: Plastic. Package contents: 1 x LED Light Dimmer Controller. Only the listed item included; other items not part of this package. Note: Lighting and display differences may cause slight color variation between image and actual item. Measurement error allowed: +/- 1-3cm.