3 5/8" overall. CREE XM-L2 U2 LED with five brightness levels. Max output of 900 lumens. Beam distance: 190m. Independent red light illumination with direct access to red light. Three special modes: Location beacon, SOS and strobe. Black HAIII military grade hard anodized aero-grade aluminum alloy body. Operates on 1x rechargeable IMR/Li-ion or 1x AA battery (not included). Max runtime 30mins (high), 12hrs (low). Impact resistant: 1.5m. IPX-8, 2m submersible. Black nylon belt sheath.