Powered by four AAA batteries, the M7 casts a powerful 650-plus-Foot beam. Perfect for professionals who holster their light. The M7 features Focus Lock, our unique bezel-locking system. The microprocessor enables you to select one of two modes: Energy Savings which optimizes your battery life or Constant Current which provides electronically controlled continuous light output. There are eight light functions in total providing everything you'll need. 8 Light functions.