SINSMART 17.3inch display Flip-up triple-screen industrial Portable laptop

SIN-S1437CU-H110 I/O Ports:1*PS/2 keyboard and mouse port,2*USB 2.0,1*COM port,2*RJ45 Gigabit LAN ports,4*USB 3.0,3*Audio jacks,1*Power input port,1*Power button,1*HDD activity indicator Reserved port expansion slot
SIN-S1437CU-H31C I/O Ports:1*PS/2 keyboard port,8*USB 2.0,2*COM ports,2*Audio jacks,2*RJ45 Gigabit LAN ports,2*USB 3.0,1*Power input port,1*Power button,1*HDD activity indicator Reserved port expansion slot
SIN-S1437CU-Q47E I/O Ports:2 x COM ports, 6 x USB 3.2 ports,2 x RJ45 Gigabit Ethernet ports,3 x audio ports,1 x power input port,1 x power button,1 x HDD indicator light port expansion slot reserved
SIN-S1437CU-R68E I/O Ports:2 x audio ports, 3 x LAN ports,6 x USB 3.2 ports, 2 x COM ports,1 x power input port,1 x power button,1 x HDD indicator light port expansion slot reserved