*** Product Description *** High-Class Cycle Light Manufacturer "KNOG" 20 Lumen LED Rear Light Built-in USB Plug No charging cable required. Designed to connect directly to a USB port. Used, in near-new condition. *** DETAIL *** ① Charging Time Approximately 4 hours ② Size Width: 14mm Length: 67mm Thickness: 14mm ③ Verification After full charge, flashing light on Approximately 7 hours 50 minutes I have confirmed the specified value, so please rest assured. In addition, the battery even unused deteriorates over time, please be careful. ④ Mounting Hardware Insert the main unit into the Velcro strap Wrap the sponge around the seat post Tighten firmly with the Velcro strap attached to the main unit. Rubber bands often come off due to vibration and are lost, but the Velcro mounting method absorbs the vibration of the rubber band and will not be lost. *** Please consider *** 20