Quantity   Component name
1 × Racall RA155/1000 Headset
1 × NATO Type 626 socket
1 × USB sound card
1 × Pre-Amp (Velleman kit K1803) http://www.velleman.eu/products/view/?id=8897
1 × Enclosure
1 × Boost converter Take 5v from USB and boost to 12v to supply preamp.