EFFICIENT PURIFICATION: This ionic air purifier releases more than 120 million negative ion-purified air to remove contaminants from your personal space. Scientifically proven, it can effectively purify air polluted by indoor air and indoor harmful substances (such as pollen, dust), second-hand smoke and bacteria, mold, compatible withmaldehyde, and even PM2.5 air pollutants, which can improve your mood and sleep.PORTABLE & DURABLE: this mini air purifier is simple and compact. It can be hung around the neck, hung in the car, very stylish, and it can be used to create a clean, good air area in travel, public places or other places with poor air quality. Let the fresh air always accompany you.NO NOISE & EASY TO USE : The sound is very quiet during operation and will not bother you when you work or rest. The operation is very simple, just press the button compatible with two seconds to enjoy the fresh air.Adjustable in two gears,the negative ion release amount of the air purifier can be adjusted in two gears, low-grade 80 million negative ions, high-end 120 million negative ions to meet your different needs.PROTECT YOUR SAFETY: Portable ion air purifiers have no radiation. Negative ions effectively combine the static radiation of TV and computer to compatible withm a layer of negative ion protection layer to reduce the damage of radiation to the skin.Long standby: 700 mAh battery capacity, charge compatible with 3 hours, high-end battery life exceeds 30 hours, low-end battery life exceeds 60 hours.Specifications:Name: hanging neck air purifierService voltage: DC5VPower: Less than 1WCurrent: Less than 50mACharging time: 2hCharging mode: type-Ccolour: random colors(black and white),don't accept the specified colorMaterial: ABS + stainless steelsize: 80x35x23mmPackage Contents: 2 * Necklace Purifier2 * USB CableOnly the above package content, other products are not included.Note: Light shooting 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.