The perfect "hidden" USB charger for bikepacking, cycle touring or the daily commute. The Sinewave Reactor takes the performance of our Revolution bicycle dynamo powered USB charger and shrinks it into a package that fits above the star-fangled nut in a threadless steerer tube, with a pass through for the 6mm bolt. The only visible part is a custom CNC-milled stem cap holding the USB connector. The cap is only 9.8mm tall and available in silver, black and red. The Reactor is compatible with 1" and 1 1/8" threadless systems. The Reactor is made in the USA. Reactor Frequently Asked Questions Reactor installation instructions An excellent installation guide, with pictures, can be found here. Unlimited Power For:Cell PhonesGPSBattery PacksRechargeable HeadlightsRechargeable SpeakersAny USB-powered device! Features:Best in class efficiencyHigh Speed Overload ProtectionEasy InstallationShock and vibration toughenedWaterproofGold-plated USB connector won't rust or corrode Specifications:Starts charging at 5.5 km/hFull charging at 14.4km/hMax current: 1 AmpAlso works with DC input up to 52VStack height: 9.8mmWire length: 91 cm (contact us if your setup requires a longer wire)Wire ends: Stripped wire (for hub connection), Reactor pins (for Reactor connection) Warranty:1 year