Topeak Whitelite and Redlite DX USB

Four super bright L.E.D.s illuminate the way and make cyclists visible to motorists.
Recharges via a mini USB port on computer.
Constant or blinking modes
Flexible hook attaches to any tube
4.5x4.2x2.8cm
38g (without battery)

Bulb: 4x super bright L.E.D.s
Battery: 3.7V 240mAh Lithium Ion
Luminious Intensity (Whitelite DX USB):
5 (Lux/5M)/2 Lux/10M)
Burn Time: 50hrs/100hrs