Stay safe day or night with the RFR Light Set Tour 90 USB. Complies with German road traffic regulations (StVZO) and features a "stand light" (stays on when you stop) and main light function. The integrated lithium (front) and lithium-polymer (rear) batteries are quick and easy to recharge via USB. And because darkness and rain often go hand in hand, the entire set is splashproof. Assembly is foolproof courtesy of the tool-free, quick-release attachment.