Mingkeda Dimmable LED Desk Lamp Eye Care Rechargeable Emergency Light, Piano Black 3 in 1 Function, desk light / flashlight / night light. Simple pushyourfingertoadjust4levelbrightness. Space-saving, easy to carry, can be charged by USB port. Step 1st-the battery using time is up to 10 hours, 2nd 6 hours, 3rd 4 hours, 4th 3 hours. 1-year warranty (quality problems under normal use) from the date of purchase and friendly customer service.