MJ-880 is NOT compatible other battery packs, helmet mount, headstrap, extension cable, "Y" cable, etc.

The latest MJ-880 uses 2 * CREE XM-L high-brightness LED to produce up to 2000 lumens output. High capacity 6600mAh rechargeable Li-ion battery pack provides long runtime. The light will let you enjoy a perfect outdoor night.

Features:

• 2 X CREE XM-L LED
• Max output: 2000 lumens
• Bionic Eagle Eye design
• High-quality and high efficiency optical lens
• Top mounted buttons for easy operation
• Luminated Eagle Eye lighthead, stylish and allowing for better visibility
• 3-color/4-mode LED indicator displays remaining battery capacity
• 6 * 18650 BAK 6600mAh Li-ion battery pack, long runtime
• New battery pack and mounting for better protection
• Talon-like basement for stable and secure mounting