How to Use: Turn on the power, press the key to turn on the switch, and it will light up. The button can adjust the brightness of the light in 10 levels Specification: Item Type: LED Double Head Desk Lamp Maximum Straightening Length: Big Lamp Head To Clip: Approx. 45cm / 17.7in Small Lamp Head To Clip: Approx. 32.5cm / 12.8in Power Supply Mode: USB Dimming Gear: 10 gears with adjustable brightness Luminous Mode: double lights all on, big light single on, small light single on Light Source: White light Switch Mode: Button type Power: 3W Material: Aluminum Life: 30000H Weight: Approx. 382g / 13.5oz Package List: 1 x Double Head Desk Lamp