Features: RECHARGEABLE AIR pumps: aquarium air pumps can be plug in and recharge to use directly. Can be used in indoor and outdoor, just hangs on your tanks. It will switchs from electric to battery operated automatically when the current electrical is interrupted BATTERY INDICATE: Blue indicators lights help clearly know the battery levels and the mode of the air pumps, making it easier to operate. TWO WORKING MODES: Continuous Mode: Touch the button to start to work all the time, the battery storage can work continuously for hours. Intermittent Model: Double-clicks to switchs form continuous mode to gaps mode, stop seconds every times and restarts work, In this case, the battery storage can work for hours COMPACT & PORTABLE: Light weight, portable and space saving. It is easy to install, requires none additional tools and can be attached to any place you like in seconds. quiet fits for both sweet water and Saltwater tanks Wonderful gift,sweet warm gift for friend family and yourself. Specifications: Materials:ABS Styles:01,02,03,04 Package Includes: 1Piece Aquarium Air pumps note: Please allow 1-2cm errors due to manual measurement. Due to the differences betweeen different monitors,the picture may not reflect the actual colour of the item.