Description: Two speed designs allow you to adjust the speed according to needs. Back hook design makes it easy for hanging on a fish box or fish bucket. Waterproof design makes it not easy to damage by water to extend service life. Mute design brings you a comfortable auditory experience. Made of high quality ABS material, it is durable. The length of the product is 11.9cm, the width is 7.8cm, and the thickness is 4.3cm. It is suitable for outdoor fishing, fish tank or aquarium. Lightweight and compact design makes it easy to store and carry. Item Name: Oxygen Pump Material: ABS Discharging Time: About 30h Battery Model: 1.5V D Battery (Not Included) Features: Waterproof, Small, With Hook Design Size Details: Size: 11.9cm x 7.8cm x 4.3cm/4.69" x 3.07" x 1.69" (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. Note: The bubble stone is put in the oxygen pump, and the back cover needs to be opened. Package Includes: 1 x Oxygen Pump 1 x Air Bubble Stone 1 x Hose