THIS IS A PROTOTYPE FROM LAUNCH KES 200 CAN BE USED CONNECTED TO A PC OR STAND ALONE. IT WAS VERY EXPENSIVE SO IT NEVER REALLY TOOK OF IN THIS COUNTRY. 500 KHZ BAND WIDTH 4 CHANNELS LOADS OF LEADS. THIS IS ABOUT THREE YEARS OLD BUT ONLY EVER USED ABOUT TWICE BLUE SCREEN ON BOARD HELP £600 OR MAKE ME AN OFFER VERY CLOSE 07802 529779