2. Convenient safe widely used portable lamp.
3. UVC light only can be work when angle is 75 to 90 degrees, which effectively
prevents burns to the human body.
4. Built-in rechargeable lithium battery can be used continuously for 7 to 10 hours,
it means a full charged lamp can be used more than 30days if we only use it 2 to
3 times a day.