The internal antenna can use 2.4 GHz frequency band and 5 GHz by the device must perform the MIMO 3Tx and can send data at 3Rx 2 Spatial Stream at least.
Internal antenna can use frequency and 2.4 GHz 5 GHz without equipment must work and MIMO 3Tx 3Rx, and can transmit data 2 Spatial. Stream has at least.