Gugou 1200 Lumens Rechargeable Mountain Road Bike Headlight with 168T USB Rechargeable Bicycle Tail Light Red High Intensity Rear LED 8.4V Li-ion Charger for most bike light or 18650 battery pack Li-ion Charger for 4 Mode 1200 Lumen CREE XML T6 Bulb LED Bicycle bike HeadLight Headlamp and Bicycle light Charger,Interface Size: DC5.5*2.1mm When it is charging for battery pack and the power consumption is not full,indicator lamp appears red, and when the battery pack is full, it appears green. 100% Satisfaction Guarantee and NO hassle 90-day Money Back Guarantee!