Steve & Leif Galaxy USB Rechargeable 3 Red LED Bicycle Lights comes with rubber pad, cable ties, double back strap, USB cable and bracket. Easy charge by taking off the rubber cover at the end of the light and plug the USB into a USB outlet (Cable Free). Yellow light will be shown when power is lower than 20%, red light will be shown when it is charging and green light will appear when it is fully charged (approx. 2 hrs). The lights has 4 functions: Super bright, boost, constant and flashing. 3 Watt Hi-Power LED meets Danish standard. Product includes high power rechargeable lithium-ion polymer batteries.