About the LEZYNE USB (Universal Serial Bus) FEMTO 15L Compact, super lightweight USB (Universal Serial Bus) rechargeable LED cycling taillight. Its durable co-moulded construction is minimal & has an IPX7 water resistance rating. A versatile mounting strap quickly mounts to a variety of post sizes. Five output modes offer up to 5-lumens & the custom Wide Angle Optics lens provides well over 180° of visibility. The Femto USB (Universal Serial Bus) Rear can run for up to 15 hours & is easily rechargeable with the included Micro USB (Universal Serial Bus) cable. A secure, threaded composite matrix cover keeps the USB (Universal Serial Bus) port clean & sealed. The Femto USB (Universal Serial Bus) is perfect for commuters & recreational riders looking for a simple & inexpensive way to add visibility. Available in four colours: Black, Red, Blue, White. Also available as a pair. Key Features Max Lumens: 15 lumens. Weight: 23g Max Runtime: 15 hours Recharge Time: 2. 5 hours About Lezyne Lezyne was founded on March 1st, 2007, by industry icon (and German native) Micki Kozuschek. At a time when poorly engineered, plastic cata log-copied accessories were the standard, Lezyne's goal was to engineer & produce premium quality accessories that meet the same high standards as high-end bicycle components. In few words, Lezyne's goal was Engineered Design. Today, the goal remains the same & Lezyne is now a cycling accessories industry leader with award winning products worldwide. Innovative products like the CNC Floor Drive with its secure ABS chuck connection, the Carbon Road Drive with light-weight Full Carbon Technology, & multi tools using Center-Pivot bit design set Lezyne apart & ahead of the competition. Lighting Buying Guide