The M12 4 tool Combo kit gives the maximum versatility to the core tradesman. With over 80 tools in the M12 system, 3 batteries in the kit and 4 powerful M12 tools, this kit provides ultimate productivity to its user. Powered by REDLITHIUM battery pack which delivers more work per charge and more work over pack life than the competitors. Redlink intelligence provides optimized performance and overload protection against abusive situations.