Any USB port may be used to recharge the strong lithium-ion battery. Constructed of a high-quality black chrome-plated metal and durable polycarbonate plastic Set the light to low for a long-lasting 5 lumen output or high for a bright 30 lumen output. Attach to your keychain or backpack to provide illumination wherever and whenever you need it, with no need to refill the batteries! It comes with a USB charging wire