Disc-O Select features four selectable colors (red, green, blue, white) and color changing Disc-O modeTool-free installationFits most bicycle wheelsWeather resistantRecharges in approximately 1.5 hours using micro USB cable (not included)Run time: 6 hoursDimensions: 4.8" x 1.8" x 1" | 120mm x 45mm x 24mmWeight: 1.2oz | 35g