Features: 1. USB Rechargeable: Built-in rechargeable lithium battery provides up to min 30hrs(SB-180) max 120hrs (SB-568 ) working time. Compared to other battery aquarium air pumps, this kind of rechargeable function free you from replace the battery, you can charge it with a laptop, a wall charger, or a power bank, save your money and eco-friendly. You can take it for outdoor fishing, fish transportation and power outages, etc. 2. Powerful Motor & 2-4 Air Outlets: Small air pump, but equipped with powerful power can generate a large amount of aeration. Put out a ton of air bubbles via 2-4 air outlets and provides a sufficient amount of water circulation in your aquarium. 3. Wide Compatibility: This quiet air pump is perfect for both Freshwater and Marine Aquariums, great to be used for all types of tanks. Excellent emergency aquarium oxygen pump! 4. Automatic Switch Of AC/DC: This USB air pump aquarium works with both AC and DC. It can be used as a standard fish tank air pump with the AC power supply plugged in all the time. While when there is a power outage, aquarium air bubbler will switch to the DC power supply automatically, powered by the lithium battery. 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:100-240V 50Hz 3. Power: 1W/2W/6W/12W/12W 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.