The Lezyne KTV PRO+ Ai Alert Rear is a compact USB-C rechargeable rear bike light engineered for riders who want intelligent visibility without adding bulk to their setup. The light uses AI-trained brake detection technology to automatically increase output intensity when deceleration is sensed alerting following traffic at the moments that matter most. Wide-angle optics cast up to 270 of visibility from a co-molded body rated to IPX7 waterproof standards making it a capable rear bike light for road commute and mixed-condition riding. A rubber O-ring mounting system secures the light to round D-shape and aero seat posts without tools. The 400 mAh battery charges via a water-resistant USB-C port and supports a maximum runtime of 28 hours and the battery is user-replaceable.USB-C cable not included.