USB RechargeableUpgraded Rechargeable, no longer need to install batteries and worry about shortage of battery power! Can last 3-6 months. LED lights will remind you of shortage of battery power. Fully charged takes 3 hours and can be used while charging. Easily Add Food: Navi-EVS can be set for 1-4 feeding times per day and 1-3 rotations per time. Ultra-quiet during rotating, stay away from noise. Adding the fish food at the top, no need to take down the food bucket, quite convenient. One-Click Setting: Long press "+" for 5 seconds to complete the default setting, feed once at 8 o'clock and 20 o'clock each day. Long press "-" for 5 seconds to clear out all settings. The 360 rotatable clamp allows you to adjust the position. Reinforced acrylic double-sided tape is super sticky, preventing from falling into the water. 9-Level Adjustable: Moisture-resistant hopper keeps fish food dry, wont get wet or jammed. It accommodates most types of food, including flakes, pellets or crumbles. 9 outlet levels for independently control the size of outlet, finely adjust the food amount to prevent over-fed. Package includes: Navi-EVS Fish Feeder*1, Clamp*1, USB Cable*1, Acrylic Double-Sided Adhesive*1, User Manual*1.