real machine modeled concave design fit the body, combined with tight anti-rotation; aluminum technology: anodic oxidation treatments Bottom foldable two cards and with 1/4 screw hole adapter rich expansion of the adapter Aluminum limit bilateral snapping, quick disassembly, connection is more tight .Bottom two card + 1/4 positioning, transfer and more anti-reversal Charging adapter seat, not need to disassemble, charging and use