1Built-in rechargeable lithium battery, 4000mA, battery life 5 hours. 2Small size, it is easy to carry, and can be used for home, business, business trips. 3It can remove second-hand smoke and purify air. 4Strong Turbo Fan - Two-level speed, low noise at work, rapid purification of second-hand smoke, strong suction. 5Easy to remove and clean, easy to replace the filter screen.Features: Built-in rechargeable lithium battery, 4000mA, battery life 5 hours. Small size, it is easy to carry, and can be used for home, business, business trips. It can remove second-hand smoke and purify air. Strong Turbo Fan - Two-level speed, low noise at work, rapid purification of second-hand smoke, strong suction. Easy to remove and clean, easy to replace the filter screen. Activated carbon filter. - It can remove 99.97% of dust, pollen, smoke, odor, mold spores and pet dander; filter particles of 0.3 microns and above, filter air pollution of pm2.5 Specification: Item Type: Ashtray Air Purifier Material: ABS+Metal Voltage: DC5V Rated Power: 4w Battery Capacity: 4000mAh Size: Approx. 15.3 x 15.3 x 6.5cm / 6 x 6 x 2.6inch Weight: Approx. 830g / 29.3inch Package list: 1 x Air Purifier 1 x USB Cable 1 x Manual Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.