Since I own most of the 2 box ever made
just a note the whites tm800 has square antennas and runs at 12khz
while the tm808 antenna is oval and runs at 6khz
tm600 and tf600 same 6khz
tm800 and tf900 same 12khz
there is another Vercion of the tf 1200
than is the tf900 but with heigher voltage