The fastest and most perfectly balanced hand gyro range on earth - capable of reaching speeds in excess of 15,000rpm all powered simply by your own hand! This superlative instrument comes complete with a digital speed meter to allow you monitor your power improvements on a daily basis and test your skills against both your friends and NSD Powerballers throughout the globe on the Top 100 scoreboard! (batteries are already installed - approximate 3 year life span) Also included are full operating instructions and 2 starter cords.