BL-Q818GT is a bluetooth GPS receiver.
BL-Q1000GT is a bluetooth GPS receiver and Data logger.
BL-818GT works with QRacing APP, after you stop the laps, session will save in QRacing App.
BL-1000GT will do all BL-Q818GT can do. Furthermore, it saves data into the MicroSD card. You can use QRacing PC Software to read and analyze the data from the MicroSD card.