The front side of the system contains two battery compartments for installing supported battery units. 

Each compartment is covered by a transparent Polycarbonate cover, this ensures the current battery status can always be seen visually without opening the system. Each compartment is also sealed with a foam pad around the edge of the opening, this creates a seal with the compartment flap.  

To unlock the compartments turn the center locking knob either clockwise or anti-clockwise to align the cut-out edge with the compartment you wish to open.

Batteries must be entered in the correct orientation, aligning the cutout ridge with the notch in the top side. 

The batteries can safely be removed at any time.