Product description: Model:CUV-303 UV lamp power: 3W voltage: 220V/240V power: 50Hz Size:45*216MM Cord length:1.80CMFor Water Capacity: MAX 50L - Included with UV-C lamp - It kills the harmful germ and algae in the aquarium and the pond which gives the safety environment to the fishes. - The germ and algae in the water will be killed when the water under the irradiation of wave length in 253.7nm's ultraviolet radiation in a short period - Suitable for both fresh water or sea water - Made of UV-against plastic. - Safe operation - Connect to 18/20/25mm tube to work with most pump.1. Make sure the product voltage is consistent to the local voltage. 2. Do not light the UV directly to protect your eyes and your skin. 3. To avoid short circuit， please keep the ballast plug clear off water. 4. Cut off the power supply before changing the UV tube. 5. Clean the quarta glass tube timely to keep a good performance. 6. Suggested mount the unit on aquarium wall vertically under water 1.5-5.0cm depth. Package Included:1PC*SUNSUN CUV-303