112V DC power supply, can be touched, safe to use. 2With power on indicator, it will light on when the solenoid valve power on. 3Lightweight and compact size, external more convenient, longer life. 4Easy to install and remove, remove the solenoid valve part, the fine adjustment valve is connected to the bubbler and the air pipe, and it becomes a non-electromagnetic version. 5Suitable for fish tank, aquarium.
