evo.com | Specialized Rear Lights > Anywhere, anytime. The Specialized Flashback Taillight mounts to your seatpost and easily clips onto a backpack or helmet. Featuring a rechargeable battery and four light modes, this 20-lumen light does it all! Steady 10 lumens for 2:00 hours IPX7 Waterproof 200mAh Battery Recharges via Included Micro USB Cable in 2:00 Hours O-Ring Mount (Extra O-Ring Included) Fits All Round Seatposts Compact, Bright, and Waterproof | Specialized Flashback Taillight 2024 in Black