HP IPAQ H5500 - Manual (Page 70)

Expansion Cards
User’s Guide 6–3
3. Insert the expansion card into the SDIO expansion slot and
push the connection edge of the card firmly into the
expansion slot.
✎
If your expansion card is not recognized, follow the card
manufacturer’s instructions to install it.
✎
To prevent power loss, remove any expansion cards from the SD
expansion slot before turning off the iPAQ Pocket PC.