If you'd like a little more information on the DC0, our friend Greg reviewed the light and we've posted it here.

This light is meant to be used. All of our lights include a battery, a cigar box, and our no-questions-asked lifetime warranty. Here are some specs on this light. 

Material: 6al-4v Titanium 
Pill Material: Copper
LED: 1 Nichia 519a 4500k
TIR (total internal reflection) optic
Modes: ML / L  / H (with off-time memory) 
Output on High: ~ 350 lumens
Forward Clicky Switch
Cell: 1 14500 ICR Lithium Ion (included)
Lens: Sapphire
Weight (without battery): 59g
Driver with low voltage warning, and reverse polarity protection