Nitecore SENSAA Flashlight. 3 1/4" overall. CREE XP-G R5 LED. Three modes: low - 6 lumen output with 60 hour runtime; medium - 20 lumen output with 12 hour runtime; high - 120 lumen output with 2 hour runtime. 53m beam distance. Uses one AA battery (not included). Includes keyring and spare O-ring.