The moisture meter can quickly measure the moisture content of the grain. 1. EASY TO CARRY: This mini USB aquarium pump is small, lightweight and easy to carry. DC 5V voltage, practical and convenient. 2. ENERGY SAVING: The power consumption of this USB oxygen pump for fishing is only 0,8W, with long service life and high energy saving. 3. SUPER QUIET: This aquarium air pump works with a very quiet but efficient motor that won't disturb you while you sleep. 4. IMPROVED MOTOR: This aquarium pump is designed with a premium version of a durable and efficient motor, perfect for fish, shrimp, and jellyfish. 5. SCOPE OF APPLICATION: This USB oxygen pump is suitable for outdoor fishing, small and medium aquariums, aquariums, pond, etc. Specification: Item Type: USB Air Pump Material: plastic Parameter: Voltage: 5 V DC Power: 0,8 W Air volume: 200 ml/min Air Pressure: 13Kpa List of packages: 1 x USB Air Pump 4 x Suction Cup 1. The air pump must be placed higher than the aquarium. If it is lower than the aquarium, a one-way guide room should be installed.2. This product cannot be poured with water. It is recommended to place a soft pad under the product to reduce wake-up sound and vibration.3. Frequent cleaning and replacement of air pipes and aeration stones can reach the maximum volume of air and prolong the life of the air pump.