There are four models of FUSIONSEEKER available:
For tracking by one axis ("single-axis" version):
FUSIONSEEKER DS-50S5
FUSIONSEEKER DS-100S10
For tracking by both axis ("dual-axis" version):
FUSIONSEEKER DS-50D5
FUSIONSEEKER DS-100D10
For details click on your model!
FUSIONSEEKER DS-50S5