The Swift™ 450 gives you more than enough lumens at our lightest weight for headlights (82 grams). NiteRider® makes this headlight USB rechargeable for convenient on-the-go charging. The Swift™ 450 features a highly durable light housing with Durable Fiberglass reinforced nylon meeting all required FL1 Standards for impact testing and water / dust resistance. Note: The NiteRider® Swift™ 450 is shipped from the factory in Travel Lock Mode. This mode feature is designed to save battery power by preventing the head light from accidentally turning on while in storage. Simply press and hold power button 8-10 seconds to lock / unlock. Vmax+™ 180 features COB (Chip-on-Board) LEDs, which for cyclists means it emits highly visible flash patterns in a smaller, more compact package. Its feather-like light weight makes it perfect as a wearable safety light—easily clipping onto straps, belt loops, and more. For added convenience, the Vmax+ 180 features mode memory, will power ON in the last mode used. Front Light Features: Lumen Output: 450 5 Modes with Run Times: 2:00 – 28:00h Charge Time: 2:00h at greater than 500mA | 3:15h at 500mA Weight: 82g Battery: Li-Po | 3.7 Volts | 800 mAh | 2.96 Wh Water / Dust Resistant IP64 Rated USB-C Rechargeable Run times per mode: Low - 11:00h at 150 Lumens Med - 5:30h at 300 Lumens High - 2:00h at 450 Lumens Flash - 11:00h at 450 Lumens Walk - 25:00h at 35 Lumens Rear Light Features: Lumen Output: 180 7 Modes with Run Times: 4:30-24:00h Charge Time: 2:00h Weight: 59g Battery: Li-Po | 3.7 Volts | 524 mAh | 1.94 Wh Water / Dust Resistant IP64 Rated USB-C Rechargeable Mode Memory (Powers ON in last mode used) Run times per mode: Fast Flash - 11:30h Slow Flash - 9:30h Disco Flash - 8:30h Econ Flash - 20:00h Pulse Flash - 5:45h High Steady - 4:30h Low Steady - 24:00h *Run times are approximations and may vary.