Grey rectangular box made of a hard, smooth material that is approximately 18.5 cm (7.25″) tall and 14.5 cm (5.75″) wide.
There is a silver hollow disc, approximately 15 mm (0.6″) in diameter at the top of the chest box.
Left side of box has a black vertical rectangle with small vertical rectangle cutout on the left side.
Black vertical rectangle has a white 3 mm (⅛”) pinstripe border off center to the right.
Black rectangle has 2 raised white acrylic or similar material 2.5 cm (1″) square buttons at the top inside the pinstripe.
Black rectangle has a metal or metal-like silver round disc with cone knob, approximately 2.5 cm (1″) in diameter, centered vertically on the black rectangle and off center to the right horizontally.
Rectangle has a metal or metal-like male silver snap, approximately 12.5 mm (½”) in diameter, just below the knob and to the left horizontally.
Chest Box has a white 3 mm (⅛”) pinstripe square approximately ¼ of the box in the upper right corner.
Square has 3 raised acrylic or similar material 2.5 cm (1″) square buttons with white in top left, and blue on the top right and bottom right quadrants.
There are 3 rocker switches below the square.
The rockers are white, grey, white in order.
Outside rockers have a black dot centered on the top portion of the rocker.
Middle rocker has a black dot centered on the bottom portion of the rocker.
Rocker switches have separation between them.
There are 2 channels in the grey box below the outside rocker switches.
There is a ribbed grey hose approximately 2.5-3 cm (1–1.25″) diameter that attaches at the left-bottom of the box with the other end connected to the flight suit on the wearer’s left side of the suit just below the flak vest and above the belt OR the wearer’s left thigh pocket.
If the hose is attached above the belt, the bottom of the hose falls approximately at belt level.
Chest box is secured around the collar and the back with olive webbing straps.
Strap around the collar is devoid of fasteners and connects to the chest box at the top corners.
Strap around the back has a silver or black “strap adjuster” style buckle in the back.
Strap around the back is worn under the flight harness.
Chest box is worn low on the chest with the bottom edge of the chest box siting approximately 5-7.5 cm (2-3″) below the bottom edge of flak vest with the bottom strap around the back passing below the front flak vest panel.
Excess strap is either trimmed or otherwise tucked to present a neat appearance.