POWER SAVE: Total power consumption only 0.32W, but have enough brightness for reading | ENJOYING READING AT NIGHT without disturbing others by easily change the direction of light | FOUR DIFFERENT BRIGHTNESS dimmable to meet your requirement on the light emitting | PORTABLE AND EASILY POWERED by 3pcs AAA batteries or USB cable(USB cable included but Batteries NOT included) | 30DAYS REFUND WARRANTY! We have confidence on our lamps! If you think any point of the product can't meet your requirement we can give you refund 30days after you bought