1. Features: - It has a 100 - 240V wide voltage input and a DC 12V output. The solenoid valve is a 12V noiseless version. - It can turn on and off automatically when used with a timer. Thanks to this CO2 magnetic solenoid valve, the timer can connect to your aquarium's lighting system and cut off the CO2 supply depending on the light, which helps keep your aquatic plants healthy, is more convenient, and saves energy. - It has a nuts - locking design for CO2 pipe connection, which is anti - shedding and has good sealing. There is little chance of leaking. - It is made of aluminum alloy material, which is strong and sturdy. It allows users to control the outlet time according to their needs, and is convenient, stable, and easy to install. - Only the CO2 solenoid valve is included, and other accessories shown in the picture are not included. 2. Specification: - Material: Aluminum Alloy - Size: app.4.7x5.1cm/1.85x2.01in - Color: Silver - Optional Style: A, B - Plug Style: US, EU - Quantity: 1 Pc 3. Note: - There is no retail package. - Please allow a 0 - 1cm error due to manual measurement. Please make sure you don't mind before placing a bid. - Due to the difference between different monitors, the picture may not accurately reflect the actual color of the item. Thank you! 4. Package Contents: - 1 x CO2 Solenoid Valve