The next evolution in cycling safety, the Light & Motion Vya Tail Light employs smart technology to provide effortless safety in an ultra-compact, convenient design. Smart sensor technology senses motion and automatically turns the Vya on when inserted into the included, easy-to-use seat post mount, and a powerful 50-lumen output optimizes your visibility on daytime and nightime commutes alike thanks to the variable SafePulse beam pattern. The smart technology also turns this light off when your bike is parked or if you remove the light from its mount, while innovative amber side lighting increases critical visibility when pedaling through crowded intersections. Plus, the Vya is made from a bio-renewable material that's waterproof to 1 meter for reliable use under uncertain skies.