The Fenix L0D is extremely small, not much bigger than the AAA cell it uses. It has five modes: Primary -> Low -> Max -> Strobe Mode -> SOS Mode, which not only allows the user to select the best compromise between brightness and runtime for any given task but also has ability to aid in an emergency. The Fenix L0D uses just one common AAA battery, and thanks to its negligible size and weight, is perfect for Everyday Carry (EDC). Moreover, its solid reliability has been strictly tested and proven.

Utilizes a Luxeon Rebel LED with a life of 50,000 hours
Five output types: 21 Lumens (3.5hrs) -> 7.5 Lumens (8.5hrs) -> 60 Lumens (1hrs) -> Strobe -> SOS
Uses one 1.5V AAA battery, inexpensive and widely available
7.35cm (Length) x 1.4cm (Diameter)
Input voltage: 0.8V~3.3V
Made of aircraft grade aluminum
Durable Type III hard anodized finish
14.5-gram weight (excluding batteries)
Waterproof to IPX-8 Standard
Toughened ultra clear glass lens with AR coating
Textured reflector for a flawless beam
Reliable twist switch
Capable of standing up securely on a flat surface to serve as a candle
Patented

Utilizes a Cree 7090 XR-E LED with a life of 50,000 hours
Five output types: 20 Lumens (3.5hrs) -> 7.5 Lumens (8.5hrs) -> 50 Lumens (1hrs) -> Strobe -> SOS
Uses one 1.5V AAA battery, inexpensive and widely available
7.35cm (L) x 1.4cm (D)
Made of aircraft grade aluminum
Durable hard anodized finish
14.5-gram weight (excluding batteries)
Waterproof to IPX-8 Standard
Toughened ultra clear glass lens with AR coating
Reliable twist switch
Capable of standing up securely on a flat surface to serve as a candle
Accessories: clip, key ring
Patented

Size compare with standard 91mm Victorinox Army Knife

Beam shots comparison