Our Go 7 device automatically calibrates as you begin driving. That is, no action is required from your end to calibrate the device. Due to the auto calibration ability of the Go 7, installation of the device is effortless. With regards to its recording scale, the Go 7 records in 8G mode. Although capable of recording in 16G mode, the device currently set up to only records in 8G mode. I have spoken to the our internal department to correct the Go 7 specification document. The output data range changes automatically when an accident level event, forces of 2.5G or greater, is detected and is automatically determined by the device. In determining the output rate, the device takes 12 sample bins of processed data at a rate of 12.5 KHz. The device then determines the average rate of the 12 sample bins taken and uses that calculated average as the output rate. I hope the provided explanation helps.