MicroSD and MicroSDHC cards are used with network cameras that are capable of recording to onboard storage.
MicroSD/SDHC cards allow for onboard storage, extending the storage capacity of your video surveillance system. Many IP cameras are equipped with MicroSD/SDHC card slots. Having on-board storage improves security by allowing cameras to continue recording even if the network connection is cut. MicroSD/SDHC equipped cameras also give you the option of just recording to the card instead of recording to a network-attached device such as a network video recorder.