The Oxford Commuter X4 Illumination System is a revolution in wearable lighting.Wearable, fibre optic rear light suitable for everyoneCan be worn on most backpacks up to 35 litresMultiple focus pointsFibre optics create a side profile at junctions andHelps HGV drivers see you more clearly from aboveLight provides 30 or 70 lumens with multiple flash and fade settingsThe Oxford Commuter X4 Illumination System offers the wearer a high degree of safety thorough its high level of visibility and flexibility. Its unique fitting system allows it to be worn over clothing or backpack (fits over most backpacks up to 35 litres).It high level of visibility is due to the independently controlled central LED and fibre optic strap, which allows the system to be visible from the rear and the sides, and features 5 modes.Running from a USB rechargeable lithium battery the communicator X4 illumination system has a run time from 3.5 up to 20 hours (depending on mode used).