1) Utilizes High CRI Nichia 219BT LED or CREE XP-G2 (R5) LED with 50,000-hour lifetime 2) Output mode/Runtime: CREE-Type: High: 110 lumens/30 Minutes, Mid(Default): 32 lumens/4 hours, Low: 5 Lumens/36 hours NICHIA-Type: High: 80 lumens/30 Minutes, Mid(Default): 18 lumens/4 hours, Low: 3 Lumens/36 hours 3) 3 modes: Mid-Low-High; Press the metal tail switch to change modes 4) Runs on: 1 x AAA (NOT included) (10440 Not Recommend) 5) Dimensions: Length: 2.91" (74mm); Head Diameter: 0.56" (14.4mm); Body Diameter: 0.56"(14.4mm); Weight: 0.78oz(22g) (excluding battery) 6) Max Beam Intensity and Distance CREE-Type: 553cd, 47 meters NICHIA-Type: 304cd, 32 meters 7) Made from aircraft-grade Ti-6Al-4V alloy that is lightweight, resistant to corrosion, wear and high temperature 8) Precision micro-textured reflector creates smooth, optimized beam 9) Double-side AR coated, tempered window resists impact and thermal shock, maximizes light transmission (99% light transmittance) 10) High-efficiency digitally regulated circuit to maintain a constant brightness as battery life diminishes 11) Glow in the Dark front O-ring around reflector 12) Diamond-cut knurling forms a decent appearance and a great grip 13) Chic yet practical electronic metal tail switch 14) Brass circuit board ensures incredible heat dissipation while the exposed brass ring becomes a wonderful decoration 15) Multi-Function, electronic metal tail switch provides one-handed operation and easy access to all functions 16) High quality detachable stainless steel reversible clip makes it durable and keeps a firm grip on your pocket or hat 17) Capable of standing up securely on a flat surface to serve as a candle 18) Impact resistance to 1.5 meters and waterproof in accordance with IPX-8 (submersible to 2 meters) 19) Market applications include, but are not limited to everyday carry, keychain, gift, emergency, security, hardware/tool and many other uses 20) Operation: Press the tail switch to turn on/off; Double Click switch to select brightness (Mid-Low-High).