Comparison : Item # 9049UN, FM Approved Class I, Division 1 Intrinsically Safe Desktop, PS/2 Model Tuffpoint Industrial Pointing Device
Item # 9044UN, NEMA 4X Desktop, PS/2 Model Tuffpoint Industrial Pointing Device
Item # 9051NI, FM Approved Class I, Division 2 Non-Incendive Panel Mount, PS/2 Model Tuffpoint Industrial Pointing Device
Item # 9051UN, NEMA 4X Panel Mount, PS/2 Model Tuffpoint Industrial Pointing Device