The piercing 50 lumen output is easily visible over a distance of 1km, even in bright daylight. What separates Vya from traditional taillights are smart auto-on/off sensors - start riding and the light turns on automatically and will shut itself off after the ride, with a delay built in for stoplights. The scientifically designed SafePulse beam pattern not only gets noticed from motorists, but allows the driver to accurately judge distance from the rider and their direction of travel - a safety feature not possible with strobing lights. Attaching Vya is effortless with a simple clockwise 1/4 turn into the mount locking the light in place and activating the auto-on feature. When it comes time to recharge, remove Vya from the mount in seconds and insert the integrated USB paddle directly into a computer or USB power outlet - no cables keeps recharging simple and convenient. The next evolution in bike safety, Vya takes powerful safety lighting and keeps the rider safe so they can focus on the road ahead.