Compact, aero-post compatible rear LED light from the brand Lezyne. This LED light features a Daytime Flash mode and Lezyne's custom programmed ""Alert"" technology. The light is equipped with a Wide Angle Optics lens, providing visibility of up to 270°, and two high powered LEDs. When decelerating, the light will turn solid like a brake light, and then flash in a distinct pattern once stopped, alerting riders or vehicles from behind. Once the rider resumes their ride, the light will return to its previous output mode.The light has a co-moulded construction, making it super lightweight and durable. It also has an IPX7 waterproof rating. The KTV Pro Alert Drive provides up to 75 lumens and offers five output/flash modes. It is equipped with an integrated USB stick for convenient cable-free recharging and can run for up to 14 hours.