GPS Watch (for running practice, etc.) EPSON SF-850 Used EPSON WristableGPS Watch SF-850. Selling due to replacement. Includes the main unit and charger. No noticeable scratches. The back of the band has some discoloration, but it's not noticeable when worn. Functions perfectly. It measures accurately from training runs to half marathons. Excellent cost performance for practice use. Will be shipped in simple packaging. Thank you.