Fenix is a leading manufacturer of LED flashlights and AA, AAA, and CR123A pocket-size flashlights. Many emergency professionals as well as hobbyists use the company's flashlights, which are known for their affordability and wide selection. Government agencies, the military, ... Read More police officers, and other rescue workers use Fenix's flashlights. The company also produces bike lights and long-range flashlights. The Fenix Flashlight TK11 R5 features a durable design for outdoor and military use; it uses 18650 li-ion or two CR123A batteries, and maintains constant brightness with two output modes. The TK11 flashlight is perfect for search-and-rescue and long-range target identification. The Fenix Flashlight E21, a portable outdoor flashlight, uses high-brightness LED and offers two types of outputs; the push-button tail-cap switch changes the lighting. All of Fenix's flashlights provide a long runtime.