Description Comes with 4 AAA batteries Red blue purple yellow green catching multicolor flashing lights Our special illumination modes are based on visual science to give visibility to you and warning to motorists Modes are easily selectable at the press of a button easy to access if you re walking running playing ultimate frisbee riding a horse or even riding a motorcycle True 360 degree illumination reflective fluorescence flexible fiber belts actively keep you safe by alerting distracted drivers and traffic before their headlights are on you The unique X shape of the led lights guarantees a larger visibility area illuminating both sides of the body and making you visible from over a quarter mile in any direction Lightweight breathable extremely comfortableI If it s for a short jog in the morning with the kids walking your dogs in the evening or an all night solo ride at only 6 5 oz you ll forget you re wearing it Using high quality sports mesh and elastic sweat resistant chafe free comfy to wear The slim minimalist design ensures minimal fabric to body contact less sweat trapping and helps it not interfere with your HRM heart rate monitor Highly adjustable Expand it to fit over your cold weather coat or jacket or adjust it down to fit more snug on t shirts or singlets during those hot summer night activities Experience a perfect fit and zero no matter the season or clothes spring summer fall or winter water resistant designSpecification