DROK 2pcs Environmental Protection Mini LED Night Light Pocket Card Lamp 3 Led Keychain Lamp USB Power Compatible with all standard USB Device it is characterized by low power consumption power supply with USB connector(especially for your unused usb smartphone charger) it is convenient and easy to carry take for the design of a hole for key chain. Small heating generator means that it generates little heating even work for long time it is a Good choice if you want to put it in baby room or aisle for decoration or whatever reasons