Features: 1.2 USB interface 2.High capacity 3.with LED lights 4. Textured How to use LED lights: The first mode. Double-click the key to open the LED lights, click the button again to become weak light, and finally click the switch LED will be closed The second mode. Long press the key to open the LED lights, click the key again to turn the flashing mode, click the switch SOS mode again, and finally click the switch LED will turn off