Arccos Golf GPS + Shot Tracking + Performance Analytics System - made for iPhone Only ***DEMO UNIT**** Item Condition: Very Good (ratings explanation) Additional Condition Consideration : We do not guarantee the Battery Life for these demo units. Buyer is responsible for Battery Replacement !! Your iPhone becomes a GPS rangefinder, providing precise approach distances to the front, middle and back of each green. Product Features : 13 Standard Sensors 1 Putter Sensor Free iOS App - Tracks performance by automatically capturing critical data for your game. Bluetooth Sensors - Virtually weightless sensors attach to the end of each club grip and track each shot you hit during every round. Each shot is recorded live and instantly saved to the cloud By automatically tracking and analyzing all of your relevant golf stats, we unlock your Golf DNA. Quick Start Guide Battery Included (See Battery Model below) Technical Specs/Analytics: Tracks your club distances and averages GPS Distances to Front, Center, and Back of Green Fairways hit or missed (Left or Right) Greens in Regulation Putting Statistics Up and Downs Sand Saves Live Shot Tracking Tour Analytics - See your handicap and percentage breakdowns for eagles, birdies, pars, bogies, and doubles+. Your data is instantly saved to the cloud Batteries: CR2032 3V for each sensor included ( Please refer to the ARCCOS Official Website under Help/Video Tutorials on How to replace the batteries )