App supported USB rechargeable light set that can be synchronized with other SYNC lights App supported functions include synchronization, light pairing, custom light modes, remaining battery level, power on/off, and find me function Headlight: Daytime HyperConstant mode makes a rider visible in the daytime Built-in fast recharging circuit Round beam with Opticube lens technology Double click changes the light pattern from current mode to High mode Five light modes - High, Medium, Low, Daytime HyperConstant, Flashing Mode memory function Tail light: Built-in acceleration sensor for Kinetic mode automatically turns on High when bike deceleration is detected Daytime HyperFlash mode makes a rider visible in the daytime Group Ride mode eye-friendly to team riders behind Battery Auto Save automatically changes to flashing mode when battery gets low Six light modes - High, Low, Flashing, Rapid, Group Ride, Daytime HyperFlash Mode memory function Black 5F/6R Combo Rubber StrapUPC/EAN/GTIN: 725012033531