This Electric Aquarium Cleaner is simple and easy to use. It can effectively and quickly complete the daily water changing work of aquarium, which would save you a lot of time to clean the tank. Compared with manual sand washer, you don't need to do the cleaning work with your hands, which is so convenient and practical! Features: Three functions combined into one: water changing, sand washing and decontamination. Dual power supply mode: can install the battery(not included) and use by AC adapter directly. Freely adjust the different length: 56cm/67cm/82cm, suitable for both shallow and deep aquarium. Can clean gravel, siphon the fish excreta and other dirt out effectively. Great for complete aquarium cleaning or quick spot maintenance. Specifications: Material: Plastic Power Supply: 2 * 1.5V C-type Alkaline Battery(NOT Included); AC Power Adapter AC Input: AC110-240V 50/60Hz Output: DC 3V, 2A Soft Hose Length: 70cm / 27.56in Package Size: 33.5 * 11.5 * 5.5cm Package Weight: 343g / 12.1oz Note: 1. Please keep the water level between the MAX and MIN, then start switch. When the outlet can draw water, raise the gravel cleaner, let the head and outlet above the water. 2. Due to manual measurement, 1-2cm error is allowed, pls in kind prevail. Package List: 1 * Electric Aquarium Water Changer Set