Features: This power cable supports charging DC5V devices from USB port. The size of the DC5V; OD: 3.5mm, Iinner diameter: 1.35mm.Please check if it is right connection port on your devices. This DC5V power cable is widely used for all kind of 5V devices, such as mini fan, desk lamp, routers, Bluetooth-compatible speakers and so on. Easy to use. USB to DC3.5mmx1.35mm power cable is durability withstands high-strength bending, longer service life. For auditory small fan flashlights 5V power cable. Specifications: Item: Round Hole Desk Lamp Charging Cable Type：usb to DC3.5x1.35mm Elbow Adaper cable Length: about 0.25metres/9.84in Outer diameter: 3.5mm Inner diameter: 1.35mm Package Includes: 1PC usb to DC3.5x1.35mm Elbow Adaper cable note: Due to the problem of lighting effect there might be tolerances in product, please understand. Please allow 0-1cm error due to the measurement