SET AIR PUMP 180L/H Noise reduction: using silica gel cushion to reduce vibration and friction, reduce noise. Double mode: continuous oxygen supply intermittent dual oxygen delivery mode, choose oxygen delivery mode according to your needs. Intelligent protection system: it can be charged during operation, when fully charged, it only works without charging. Convenient: USB cable, multiple charging methods, suitable for emergency outdoor oxygen delivery and transportation. Automatic switching: when switched off, it will automatically switch the lithium battery to work. Specification: Item Type: Oxygen Pump Material: plastic; Power Mode: USB Power: 1 W Air volume: 3 L/min Pressure: 2 x 0,018 Mpa Suitable for aquarium: 30-50 L Battery: lithium battery (with built-in battery) Battery capacity: 2600 mAh List of packages: 1 x oxygen pump 1 x air hose 1 x air stone 1 x Instruction 1x USB cable Note: This product must not be submerged in water. Connect the SUB cable to the power supply, turn on the switch to select the mode you want to use. Power display: charging for the first time, charging until the headlight turns red, four indicator lights flash in turn. Full charge indicator is all on and charging status is automatically off Four lights on means 100%, three on means 70%, two on means 40%, one on means 10% Switch key: Press once: continuous operation Press twice: work in intermittent mode for 10 seconds, stop for 10 seconds Press three times: stop working