Vmax+ 180 ALTO features Brake Sensing Technology indicating to those following behind that you're slowing or coming to a stop. The Vmax+ 180 ALTO also features 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 runtime2-hour USB-C recharge time and 59g weightFeatures brake sensing IP64 water/dust resistanceRemembers last mode used when powered on