Designed to offer a premium light option for commuting use, the Exposure Sirius Mk.1 provides enough light to illuminate even the darkest city streets with its Cree XPG LED. A pulsating mode provides maximum visibility & can even be seen during the day! Supplied with the new Sirius handlebar mount that is designed to be quick & easy to attach so you can take your light with you to prevent theft. Cable Free Design (CFD) A primary feature, unique to Exposure Bike Lights. Cable Free Design removes the hassle of cables & straps by containing all the lights necessary parts in a lightweight CNC machined case. A stronger QR bracket helps deal with the additional weight on your bars by providing a rock solid attachment. Smart Port Technology Plus (SPT+) Use a wide range of accessories without the need for more batteries, SPT+ accessories include rear lights, pack up batteries, remote switches & even the capability to charge your other USB (Universal Serial Bus) devices using your lights battery. Intelligent Thermal Management (ITM) Combating the lose of efficiency of LEDs at elevated temperatures, Intelligent Thermal Management maintains the optimum output & battery life by controlling the core temperature of the light helping it stay Brighter for Longer. Collimated Lens Technology Exposure lights use high tech resin lenses which maximise light collection from the LEDs to produce an optimum beam pattern for cycling & ensures that no light output is wasted. Gold Plated Charge Port Enhanced corrosion resistance & more efficient conductivity, the Gold Plated Charge Port helps extend the life of your light by adding greater protection from the elements. Storm Cap Protecting the Smart Port, the included Storm Cap is a small silicon cover that stops you pushing dirt into the port helping to boost the performance of your SPT+ accessories & extends the life of your light. Waterproof Body CNC machined from aerospace aluminium with a heat transfer design & fully sealed. Manufactured in the UK.