It allows a combination of 2 of the follow 0.5U products (or any 1 by itself): -AD-100 + AD-100 -AD-100 + VS-150 -VS-150 + DAC-90 -VS-150 + NVS-25 (or NVS-20) -VS-150 + VS-150 -HDR-1 + NVS-25 (or NVS-20) . . .

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It allows a combination of 2 of the follow 0.5U products (or any 1 by itself):
-AD-100 + AD-100
-AD-100 + VS-150
-VS-150 + DAC-90
-VS-150 + NVS-25 (or NVS-20)
-VS-150 + VS-150
-HDR-1 + NVS-25 (or NVS-20)

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