THE R-400 IS JUST LIKE THE QUICK TRACK 6000.IT TRACKS 216-220.ITS ON A QUICK SHOT ANTENNA AND LOOKS BRAND NEW.I HAVE 8 TRACKING COLLARS,7 WORK GREAT AND 1 STOPPED BEEPING,PUT NEW BATTERY IN STILL DOESNT WORK.ASKING $600 OR TRADE FOR GARMIN GPS SYSTEM.I HAVE PICTURES ON MY PHONE OF EVERYTHING.CALL 252-907-8622