Multifunctional Mousepad Mouse Pad 4 Ports USB 2.0 1.1 HUB Calculator with LED Mouse Pad Calculator with USB HUB: 4 USB HUBS (one in, three out).Type A:without USB hub Type B: Version 1.1 Type C:Version 2.0 10-Digital arithmetic; Mousedpad Material: Plastic Size: 21x18x1.4cm