Yes, you can. All EnGenius PoE switches have auto-sensing PoE ports. This means that the PoE port will detect if the connected device is a PoE device or not. Please check if the PoE device is 802.3af or 802.3at compliant to make sure that it is compatible with the EnGenius switch.
There is also the option to disable the PoE capability per port on all EnGenius PoE switches. Just go to PoE Port Settings and set the State to “Disabled”.
Note: The EGS2108P, EGS2110P, and the EWS2910P PoE ports are 802.3af compatible. They are not 802.3at a.k.a. PoE+ compliant.