Feature / Specifications:Main Feature: Portable LED USB Desk LampLight Source: LED BulbsOperating Method: USB Plug-inProduct Color: White/BlackApplication: Reading, Studying, Working,Office,BedroomBattery model: polymer lithium batteryBattery capacity: 400mAhRated power: 3WRated voltage: 5VRated current: 1AData cable length: 0 Charging duration: It takes roughly 1 hours for the product to completely charge charging, the purple gentle stays on, and when totally charged, the fairway light stays on entirely charged, low brightness light fixtures will final for roughly 24 hours, and high brightness lighting will final for approximately 3-5 hours Product Usage Operations1. Key on: The first press is for the cold white light, the second press is for the warm yellow light, the zero press is for the warm white light, and the fourth press is to turn off the light. Infinite dimming: When the sunshine is on, lengthy press the button to regulate the brightness of the light. (The mild has no memory function.