Advanced taillight with "Ai Alert" brake-sensing technology; Intelligently detects deceleration and changes output mode alerting others you're slowing down; Highly visible saddle-mounted rear light; Max 250 lumens in Active Alert or 60-hour runtime in Femto mode; 7 combined solid and flash output modes including Highly disruptive Day Flash mode; Fully CNC machined Aluminum construction; Wide Angle Optics provide 270 deg of visibility; USB-C charging (cable not included); Rigorously tested to IPX7 Waterproofing standards