The reactime with the without the timing is about 1500 us with the wireless tmer its about 2900… Its basically the false start system with a few extra pieces of software. Like a starters voice with a gun sound and what ever else… You dont need this to train (look at CF’s results way before this came out) but it’s the only way that you can validate these test times… But remember in the end its the comp time that matters… My point is its a nice tool but if you really want to test enter a race with FAT and that will tell you the whole story and a video…