Quiet and Safety: Wide voltage input 100-240V, output DC 12V, the solenoid valve is an updated 12V noiseless version. High quality power cord (total length of the power cord is 90cm), with "anti-shock" charger, safety and no safety hazards. Adjustable: Automatically turns on and off when used with a timer. With this CO2 solenoid valve, the timer can connect your aquarium lighting system and cut off the CO2 supply according to the light. Keep your aquatic plants healthy, more convenient and save energy. Suitable for: Two ends connect 4*6mm tube or bubble counter (double head solenoid valve). Anti-shedding and good sealing. No leakage. Durable and Easy to Control: Be made of aluminum alloy, solid and sturdy. Low temperature design, temperature below 30°, low heat and low noise. According to the user's need to control the output time, practical, stable and easy to install.