... Super slim, only 7mm LED Multifunctional Mousepad Calculator with 3 USB Port Features: 1.Battery InstallationOpen the battery cover, insert one AGl3 ... same specifications. Detail information:1.Mousepad Calculator with 3 Port USB 2.0 HUBs (one in, three out)2.Can be used as ... both Mousepad and Calculator, also with 3 Port USB 2.0 Hubs,3.can be connected with USB connector. 4.10-Digital arithmetic, Memory ...