Simple GPS cycle computing! Using GPS technology the Stealth delivers all your usual easy to use Cateye features & functions to the head unit without sensors on your forks or chain stays. Once home simply plug your head unit into the USB (Universal Serial Bus) docking station provided & download your ride data to CATEYE Atlas to review on maps & graphs; your route speed altitude data etc. & share with friends via Facebook or Strava if you like! Stealth 50 Features Include:-GPS Enabled Cyclocomputer-125 second GPS logging interval storing up to 60 hours of data.-USB Cradle for recharge & data download-Fully enabled Cateyeatlas.com website to review & share rides -Setup by PC Software Â- Cateye Sync-Full time backlight-Auto start/stop-Flextight Handlebar Bracket Stealth 50 Head Unit Functions Include:-Current / Maximum/ Average Speed-Odometer-Trip Distance 1 & 2-Elapsed Time-Clock* Then review much more on Cateyeatlas.com With ANT+ enabling to allow upgrade to receive Cadence/ Heart Rate/ Power & Speed (for use on turbo trainer) data from optional ANT+ sensors. Cateye ANT+ sensors sold separately.