The TP-Link TL-MR6400 router uses a MIMO (Multiple-Input Multiple-Output) system for its LTE connection by employing two external, detachable antennas to improve connection stability and efficiency, though it doesn't explicitly state its MIMO order (e.g., 2x2). These antennas support a 4G Cat4 LTE connection, providing up to 150 Mbps download and 50 Mbps upl...