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 up to 270° 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. Max Lumens: 5 lumens. Weight: 23g. Max Runtime: 15 hours. Recharge Time: 2.5 hours. Colours: Black Red Blue or White.