Vmax+ 180 is NiteRider's 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 light--easily clipping onto straps, belt loops, and more! For added convenience, the Vmax+ 180 features mode memory, will power ON in the last mode used. - 180-lumen output with 7 modes and 4.5-24 hour runtime - 2-hour USB-C recharge time and 59g weight - IP64-rated for water and dust resistance - Mode memory powers on in last used setting