HI3520: DS-7204HVI-SV DS-7204HWI-SH DS-7304HFI-SH DS-7304HWI-SH HI3521: DS-7208HVI-SV DS-7208HFI-SH DS-7208HWI-SH DS-7216HVI-SV DS-7308HFI-SH DS-7308HWI-SH HI3531: DS-7216HFI-SH DS-7216HWI-SH DS-7316HFI-SH DS-7316HWI-SH