Features: 1. Aquarium air pump with different quantity of outlets,easy to insert multiple fish tanks or aquariums through the outlets, widely suitable for freshwater and marine aquarium fish tank. 2. Adjustable Air Flow: Feature a rotary knob to control the amount of air for dual outputs, allowing for your desired air flow to fully oxygenate your fish tank.(DB-701&DB-702 is not adjustable flow.) 3. Ultra Quiet air pump for aquarium Minimum 25 dB: Built-in full copper motor and thin piezoelectric ceramic plate, more effectively reducing the noise than traditional fish tank bubbler pump when working. Minimum 25 dB in lowest flow rate 4. Shockproof & Stable Performance: With 4 solid rubber feets on the bottom ensures to absorb and reduce the noise generated by the friction. For better noise reduction, It is recommended to put a towel or blanket under fish tank air bubbler 5. Pump Accessories: Include: air stones, airline tubing, check valve. Complete accessories to build the basic aeration setup in your tank.please note that the accessories sold separately. Specifications: 1. Material: plastic & magnet 2. Voltage:220-240V 50Hz /110-120V 60HZ 3. Power: 3W/5W/8W10W/12W/14W Caution: 1. We may send you a plug adapter(EU, US, AU, UK,etc) according to your country . If you need another type, please leave a message after ordering or contact us directly. 2. Please double comfirm your local voltage and frequency before you place the order.If not match,the pump would not work. 3. There might be performance tolerance becuase of the tolerance of your local voltage and frequency.