The Rock II wireless guitar controller offers a 7 meter wireless range using 2.4GHz frequency for up to 80 hours of play on one battery pack (3 AA batteries not included). Engineered and refined under most rigorous testing to ensure maximum fun, durability and useability. The Guitar Hero Rock II Wireless Guitar controller lets you activate the Star Power bonus of the game by simply tilting the guitar instead of turning it upright. Redesigned recessed Start and Select buttons prevents accidentally pressing those buttons while you're rocking. The Rock II Wireless Guitar Controller is optimized in size and length which lets you play longer and harder. Compatible with Sony Playstation 2 Guitar Hero and Guitar Hero II. Rock II Wireless Guitar Controller features:

* Smart AutoSense 2.4GHz Wireless Technology - Unlike infrared wireless systems that require a clear line of sight, the Rock II automatically detects single or multi-user channels and offers a 7 meter range of true 2.4 GHz wireless connectivity for up to 80 hours of play on one battery pack. No manual channel settings are required.
* Responsive Fret Buttons - Feather-Touch Fret Buttons activate with the slightest touch--no need to depress the buttons all the way.
* Sensitive Neck Design - The edge of the Comfort Neck is curved for extra comfort.
* Patented Button Cluster - Players love the durable hardware and advanced button placement because it lets them kick out the jams without accidentally pausing the game!
* Super Whammy System - Chrome-look whammy bar system is finely tuned and spring loaded with high density coil spring for extreme durability and excellent response!
* Smart Star Power Sensors - The Smart Bidirectional Accelerator sensor doesn't just feature one sensor - it features two sensors so players can activate the Star Power mode by simply tilting the controller in addition to the standard upright tilt method.