With a rechargeable battery which can work for 10 hours.  AC,DC are available.                                                                                                                                     

LED lamp power: 3w, colour temperature: 6000k

Facular can adjust at the 250mm, ranging from 6mm to 65mm

After full charged, battery can last for 10 hours

Life of the bulb: 20,000 hours.

Comfortable for wearing, more dapper, size is adjustable