120 Million Negative Ion Air Purifier Mini Hanging Neck Purifier 1. Negative ions effectively purify the air, remove PM2.5, dust, harmful substances, viruses, bacteria, etc.; 2. Especially suitable for children, the elderly, pregnant women and those with pollen allergies and odor sensitivities; 3. Effectively control bacteria and other infections around people, and keep away from respiratory diseases; 4. It can be used continuously for 30 hours on a single charge; 5. Purify the surrounding environment anytime and anywhere; Parameter: 1. Working voltage: DC5V 2. Power: less than 1W 3. Current: less than 50mA 4. Battery capacity: 700mAh 5. Negative ion concentration: 12000Wcubic centimeter 6. Product size: 70 x 34 x 18mm 7. Battery life: 30 hours 8. Charging time: 2 hours 9. Charging method: TYPE-C 10. Product weight: 42g 11. Product material: environmentally friendly PC