DROK 5PCS Super Bright Warm White Micro USB Power Touch Switch LED Night Light 3LEDs 5V 150mA Portable Nightlight with USB Connector Keying Hole for Home Decoration Camping Lights Gifts Plug into USB port then touch the exposed contacts to turn ON or OFF. Power supply: power supply with USB connector(especially for your unused USB smart phone charger). User-friendly design, a hole for keychain, can attach it to your keychain or a lanyard, easy to carry out. Good choice for the Xmas gift for friends, Xmas decoration, emergency flashlight, room illumination. Please note that the USB nightlight is not dimmable and will generate a little heating after working for long time.