DROK 5PCS/LOT 5V 150mA 6000k Handy USB Power LED Night Light with Automatic Light Control White 3 LEDs Dimmable Nightlight Energy-Saving Lamp with Keyring Hole for Home Decoration Camping Lights Plug into USB port then automatic monitoring ambient light to control light switches and brightness. User-friendly design, a hole for keychain, can attach it to your keychain or a lanyard, easy to carry out. Power supply: power supply with USB connector(especially for your unused usb smart phone charger). Good choice for the Xmas gift for friends, Xmas decoration, emergency flashlight, room illumination. Note: the USB nightlight will generate a little heating after working for a long time.