Usage: Connect the adapter with 5V input voltage to turn on the desk lamp Specification: Item Type: LED Long Arm Folding Table Lamp Material: aluminum alloy body + metal clip + hose Size: Lamp Holder: Approx. 35.5cm/14.0inch Upper arm: approx. 36 cm Forearm: Approx. 37 cm The maximum thickness of the clip can be clamped: Approx. 6.5 cm / 2.6 inch Lamp Beads: 30pcs x 0.2W Working voltage: 5V DC (via USB interface). Power consumption: 12W (more than 90% energy saving) Luminous flux: 1000Lx Color rendering index: >80 Illumination Angle: >180° Light Color: White Light, Warm Light, Natural Light Color Temperature: 3500-6000K Brightness: 10 levels of brightness Scope of application: office, study, bedroom, dormitory, school, hotel, tattoo, tattoo, eyelash extension, manicure, etc Package List: 1 x LED swing arm lamp 1 x clamp 1x Manual Note: Please allow some errors due to manual measurement.