The Cat Eye Nano Shot Plus emits 600 lumens of light & has 3 different modes: High, Low & Hyper Constant (flashing). Hyper-Constant mode puts the light on the low setting while simultaneously flashing on high, so the cyclist can see the road while also being seen by motorists. This “ See & Be Seen” makes it absolutely ideal for urban city commuting. The Nano Shot Plus also has an optional helmet mount. When set on high, it’s a great trail riding light. The body is a special lightweight composite that helps dissipate the heat to provide optimal performance. Run times: High mode for 1.5hrs, Low mode for 4hrs, or Hyper-Constant mode for 2hrs. 160 g. Dimension: 96.4 X 58.6 X 35.6mm Weight: 160 grams (light unit & battery) Light source: High intensity white LED X2 Light output: 600lm / 5000cd Run time: High mode : approx 1.5hrs Low mode : approx 4hrs Hyper Constant mode : approx 2hrs Battery: Li-Ion rechargeable battery (3.7V-2800m Ah) Recharge time: approx 8hrs (USB2.0 recharge) 80% full recharge in 5hrs. Recharge/discharge number of times: about 300 times(until the rated capacity drops to 70%) Other: Low battery indicator, lighting mode memory function