Headlight: 35 to 95 lumens output. Headlight: 1.35 hours to 13.5 hours runtime. Tail light: 7 to 18 lumens output. Tail light: 2.5 hours to 23 hours runtime. Charge in the USB port of any laptop or phone charger in two hours (no extra cables needed). Flexible mounting system works with handlebar and seatposts from 22.2mm up to 35mm in diameter, as well as most seatstays. (Aero strap mount available separately) Six headlight modes including: Steady High (70 lumens), Steady Low (35 lumens), Power Surge (70 lumens), Power Flash (95 lumens), Disco Flash (35 lumens), Eco Flash (35 lumens) Six taillight modes including: Steady High (16 lumens), Steady Low (7 lumens), Power Surge (16 lumens), Power Flash (18 lumens), Disco Flash (7 lumens), Eco Flash (7 lumens) Red/Green battery charge level indicator. Additional mounting options available separately.