Preon 2, Blue, S2 LED: CREE XP-G S2 with a Max Output of 120 ANSI lumens Lens: Optical-grade glass lens with anti-reflective coating on both sides Material: Hard-anodized Aircraft-grade Aluminum Seven Output Modes: Low: 3 OTF Lumens, 23 hours Medium: 26 OTF Lumens, 6 hours High: 120 ANSI Lumens, 0.8 hours Strobe SOS Beacon (Hi) Beacon (Lo) Battery: Two AAA, included (see voltage range to select acceptable batteries for this light)