Our oxygen pump is mini and USB power supply. You can use it with mobile phone chargers, power banks, car phone chargers, computers, etc. It is convenient for you to go fishing and carry it. What the high-quality air bubble stone can offer you is that it can produce finer bubbles and enhance the effect of dissolved oxygen. Using copper as the motor material, the performance of the aerator pump is stable. Our oxygen pump is silent and energy saving, and it can provide your fish a comfortable and fresh water environment. Made of high quality plastic material, the aquarium oxygenator is eco-friendly and durable. The length of the mian body is about 8cm, the width is about 3.5cm. It is suitable for aquarium oxygenation, outdoor fishing, seafood oxygenation, etc. Item Name: Aquarium Air Pump Material: Plastic Color: Black, White, Pink, Green Features: Silent, Energy Saving, Portable Size Details: Main Body: 8cm x 3.5cm/3.15" x 1.38" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Aquarium Air Pump 1 x Hanging Buckle (Random Color)