The Swift 500 gives you more than enough lumens at our lightest weight for headlights (82 grams). NiteRider makes this headlight USB rechargeable for convenient on-the-go charging. The Swift 500 features a highly durable light housing with Dupont Fiberglass reinforced nylon meeting all required FL1 Standards for impact testing and water / dust resistance. Vmax 150 is NiteRiders first taillight featuring COB (Chip-on-Board) LEDs, which for cyclists means it emits highly visible flash patterns in a smaller, more compact package. Its feather-like light weight makes it perfect as a wearable safety lighteasily clipping onto straps, belt loops, and more. For added convenience, the Vmax 150 features mode memory, will power ON in the last mode used.