[Product function]It mainly produces a large amount of negative oxygen ions, which can effectively remove small particles invisible to the eye in the air and eliminate second-hand smoke.This ion air purifier releases more than 10 million negative ions to purify the air to remove contaminants in personal spaces. It can effectively purify the air polluted by indoor air and indoor harmful substances thereby improving your mood and sleep. [Product advantages]10 million PCS/cm Negative ions exist in high concentrations in waterfalls, forests, and beaches, and have many positive effects on human physical and mental health. Negative ion breathing has a relaxing effect, relieves tension and brings you a good mood. Make you feel refreshed immediately. Among the advantages are: start to get better sleep quality, improved concentration, clearer immune system, reduced headaches and greatly improved body function. [Comes with lanyard]light weight and portable size, you can wear it all day without feeling tired. 't disturb you even while you are working or taking a rest with quiet fan and motor. [Long battery life]fully for 0.8 hours, can last 20-24 hours, usb recharging ready to charge at any time. [ Simple to Use]The portable air purifier is small and does not require complicated settings. Press and hold the power for 3 seconds to turn the power on and off. It can be easily used by the elderly and children. No troublesome maintenance, no filter replacement, quiet design, no operating noise. This is an ultra-quiet design. It is comfortable to wear, silent and portable. Rated voltage: DC5V Product power: less than 1W Battery capacity: 250mAh color: random colors, don't accept the specified color Material: ABS size: 47x47x17mm Package Contents: 1 x Air Purifier 1 x lanyard 1 x usb cable 1 x Chinese and English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.