Data Key is very useful to store data sampled by MyChron4 and to download them on a PC for analysis through the powerful Race Studio 2 software.
With its 32MB memory it can record numerous sessions data.
Thanks to Data Key there is no more need to wait for data download: just remove Data Key from MyChron4 and plug it in PC USB port like a normal compact flash.
No session (race or test) stop is needed if another Data Key is immediately connected to MyChron4.