App supported USB rechargeable light set that can be synchronized with other SYNC lightsApp supported functions include synchronization, light pairing, custom light modes, remaining battery level, power on/off, and find me functionHeadlight:Daytime HyperConstant mode makes a rider visible in the daytimeBuilt-in fast recharging circuitRound beam with OptiCube lens technologyDouble click changes the light pattern from current mode to High modeFive light modes - High, Medium, Low, Daytime HyperConstant, FlashingMode memory functionTail light:Built-in acceleration sensor for Kinetic mode automatically turns on High when bike deceleration is detectedDaytime HyperFlash mode makes a rider visible in the daytimeEye-friendly Group Ride mode won`t blind those behind you yet still increases overall visibilityBattery Auto Save automatically changes to flashing mode when battery gets lowSix light modes - High, Low, Flashing, Rapid, Group Ride, Daytime HyperFlashBlack5F/6RComboRubber StrapUSB500/50UPC/EAN/GTIN: 725012033531