• Premium Cree XM-L LED
• Powered by 4*CR123 or 2*18650 batteries
• Aero grade aluminium alloy construction
• High performance reflector-based optic system
• Fully regulated advanced power management
• Reverse polarity protection circuit
• 2 modes of output
• AR coated scratch-resistant mineral glass lens
• Type III hard-anodized finish for corrosion and scratch resistance
• IPX-8 Waterproof (submersible up to 2 meters)
• Impact resistant to 1.5 meters

Specifications and Performance
• LED: CREE XM-L
• Maximum output: 830 lumens
• Maximum runtime: 11 hours
• Battery: 4*CR123 or 2*18650
• Reflector: Precision aluminium reflector
• Dimensions: Head Diameter 48mm, Tube Diameter 25.4mm, Total Length 223mm
• Weight: 227g (without battery)

Reviews:
1. JETBeam know how to manufacture excellent flashlights. The BC40 is a powerful, easy to use and affordable flashlight without any competitor at the moment! ------Markus
http://www.flashlight-blog.de/jetbeam/review-jetbeam-bc40-830-ansi-lumen-max/

2. While there are still a few areas for potential improvement (as with any light), in my opinion the BC40 is a fantastic bargain in this space at the moment. ------Selfbuilt
http://www.candlepowerforums.com/vb/showthread.php?314962