【Environmental Friendly】 Powered by solar energy, no battery or electricity needed, energy-saving and environmentally friendly. 【Meet your needs】 With small size, low noise and large air volume. You can fall asleep normally while working. 【Good quality】 Made of high quality ABS, built-in high quality lithium battery, sturdy and durable 【High capacity battery】 Built-in 3600mAh high capacity battery, it can work constantly for up to 14 hours once fully charged. Meanwhile, this air pump can be recharged by DC power with a USB cable. 【Advanced Design】Technologically advanced design provides smooth and quiet operation. At the same time, it has an elegant blue appearance. Charging input: DC 5V/1A. Capacity Battery capacity: 3.7V/3600mA/h Atmospheric pressure: 0.15mpa Gas volume: 2L/min Product size: 100*80*38mm Product weight: 213g Standard packaging: hose*1, check valve*1, stone air*1, charging cable*1, footrest*4, hanging buckle*1, screw*1 solar panel*1 Note: The data are all manual