Item Type: Wearable Air Purifier_x000D_ Material: ABS_x000D_ Weight: Approx. 82g/2.9oz_x000D_ Size: Approx. 70x26x15mm / 2.76x1.02x0.59in _x000D_ Built in Battery: Polymer Lithium Battery 3.7V 250mAh (included)_x000D_ Rated Power: 1W_x000D_ Operating Temperature: -10-50_x000D_ Operating Current: 25mA_x000D_ Charging Method: USB_x000D_ Number of Negative Ion Release: 2800W/cm3_x000D_ Applicable Area: 1m3_x000D_ Length of Use: 15H 1Effective Air Purification: Wearable air purifier releases 2800W/cm3 negative ions, which can effectively resist air pollutants such as pollen, dust, smoke; relieve asthma, nasal congestion, etc. 2Ionic Working Principle: Wearable air purifier uses ionic technology, ions are negatively charged atoms, molecules or complex molecules that contain more electrons than normal. 3Easy to Operate: Portable air purifier is easy to use, just long press for 2s, the 'V' signal light comes on, which means the purifier has started working, long press again, the signal light goes out and stops working. 4Lightweight and Fashionable: Portable negative ion air purifier is compact and light weight, very light to wear around the neck, fashionable style, can be worn indoors, outdoors, office, subway, airplane and other places. 5Applicable People: Mini portable negative ion generator is ideal for children, students, the elderly and other groups of people to use, is a ideal gift for family and friends.Please allow for some errors in manual measurements. 1 xWearableAirPurifier 1 x Lanyard 1 x USB Cable 1 x Manual