Krisvie Activated Carbon Dustproof Dust Mask Filtration Exhaust Gas PM2.5 for Running Cycling Outdoor Activities LED: CREE XP-G R5, Max Output: 189 Out-the-front (OTF) lumens Material: Type-III Hard-anodized Aircraft-grade Aluminum Lens: Optical-grade glass lens with anti-reflective coating on both sides Battery: One lithium CR123A (3V) - do not use rechargeable RCR123As Seven output modes: Low, Medium, High, Strobe, SOS, Beacon (hi), Beacon (lo)