The Shuttle XPC accessory WWN03 allows the Shuttle XPC slim Barebone DS10U to be upgraded with an LTE/4G function for mobile network. The LTE card will occupy the 2.5" bay, so you have to use an M.2 SSD as mass storage device. The required LTE/4G card in M.2-3042 format and an activated Nano SIM card is not included in the scope of delivery. The existing WLAN function of DS10U can still be used then.