Features: [Front+ Back Dual Light]- This light set has white light on front to guide the road ahead and red light on back to remind people and riders behind you. Front light is 3 gear adjustable ( high- mid- strobe ) and back light has indicators to show battery status. [USB Rechargeable]- With built- ion 2000mAh battery and attached charging cable, this light can last for long time after being fully charged and be easily charged by PC USB, USB wall charger and etc. [Adjust To Fit]- Strap with buckle and high elasticity can be easily adjust for a comfortable and snug fit to make sure it won't slip off or shake violently during movement. [Lightweight & Comfortable]- Lightweight design ensures wearing comfort and won't place burden on the body. Compact size, easy to carry around and use anywhere anytime. [IPX4 Waterproof]- Waterproof rated at IPX4, this light is ideal for outdoor activities. Perfect for night running, walking, jogging, camping, hiking and fishing, helping you see and be seen in dark to improve safety. Specification: Item Type: Night Running Light Battery Capacity: 2000mAh Charging Method: USB Charging Material: Plastic+ Elastic Band Front Light Diameter: 4. 8cm x 4. 8cm Back Light Size: 10cm x 5. 5cm Color: Green+ BlackNote: Please allow 1- 3cm ( 0. 4- 1. 18" ) difference due to manual measurement and slight color variation for different display setting.Package Including Package Includes: 1 x Night Running Light 1 x USB Cable