THTF TF-YS07 7-inch dual core Android 4.2.2 operating system 4GB storage memory supports extend the memory up to 32GB supports external 3G USB dongle and Word/excel/ppt/pdf and other office tools supports WIFI and OTG function it can surf the Internet through WIFI and to realize external 3G wireless surfing function through the OTG cable just needs to buy a 3G mobile module to connect the OTG interface to have 3G network connection or to buy a wired Ethernet adapter cable to connect the OTG interface to have Ethernet connection network operation then can enjoy the pleasure of wireless 3G network.