Using a nicely integrated mount for the Brompton, the Volt300 is a USB rechargeable headlight that features quick-change cartridge battery and 400 lumen output in compact design. This light features five modes: High, Normal, Low, Hyper Constant and Flashing. The Brompton Volt400 is mounted on the front fork using the brake caliper mounting bolt. Spare cartridge batteries, ideal for long rides and commuting, and charging cradle are available as add-on parts and can be changed safely and easily without any additional tools.

• Dimensionï¼Âš111.5 x 31.0  x 38.0 mm
• Weightï¼Âš120 grams (light unit and battery)
• Light sourceï¼ÂšHigh intensity white LED X1
• Light outputï¼Âš400 lumen
• Run timeï¼ÂšHigh mode (400 lumens) : 3hrs
• Normal mode (100 lumens)ï¼Âš8hrs
• Low mode (50 lumens)ï¼Âš18hrs
• Hyper Constant mode (400/50 lumens)ï¼Âš11hrs
• Flashing mode (50 lumens)ï¼Âš60hrs
• Batteryï¼ÂšLi-ion rechargeable battery (3.7V-2200mAh) 
• Recharge timeï¼Âšapprox 6hrs (USB2.0 recharge), 3hrs via optional fast-charging cradle
• Recharge/discharge number of timesï¼Âšabout 300 timesï¼Âˆuntil the rated capacity drops to 70%ï¼Â‰
• Other: Low battery indicator, lighting mode memory function.