STEALTH 50 GPS WITH ANT+ HR & SPEED/CADENCE SENSOR 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!