Aquarium Gravel Vacuum Works Two Ways By Plug In Or Rechargeable Use: Innovative patented design water changer,3 power supply modes can be selected, increasing the convenience of daily use： It is used by plugged in. After fully charged, disconnect the adapter and use it, and it can be moved freely without being restricted by the length of the cord and place. While charging while using, the battery will store electricity at the same time. Please fully charge before use. Key Features: 1. Included: • 1xduckbill suction inlet with a spatula • 1xgravel washer • 1x 6.5ft water tube(14MM-18MM) • 1xAdapter • 1xwater pump • 2x extension tube • 1xmotor controller with clip • 1xtube connector • 1xbucket plastic clip, • 2 water pipes 2. Energy saving & powerful fish tank siphon vacuum cleaner. 3. Powerful Electric Water Changer, Use of the Site and Water Pressure is Unrestricted: Compared with the traditional siphon water changer, the new electric water changer can be used whether it is pumping water from high to low or from low to high, and it is not limited by water pressure 4. Water at the bottom of the fish tank can be pumped clean, there is no minimum water level 5. Free Your Hands, The motor controller with a clip, can be adjustable according to the thickness of the fish tank 6. Different flow grades can be adjusted according to different needs, maximum flow is 420GPH(1600H/L) 7. We recommend that you drive to the maximum grade first and then lower the gear 8. This approach will quickly start the motor and increase the flow rate 9. Follow the battery at any time through the battery indicator 10. Can be used for 2 hours when fully charged 11. The main function is automatic changer water, sand washer, debris cleaning water filter 12. Both large and sma...