High speed 4G LTE Chipset, Support TDD-LTE/FDD-LTE/UMTS/4G/3G networks; Support 10 WiFi users; convenient English system; Plug&Play,easy to use;Plug to Windows computer USB port to work as USB modem; Power input: 5V1A-2A USB charger to charge its built-in battery .American version(US): 4G LTE: B1/B2/B4/B5/B7/B17 3G:B2/B5 American version works in most American countries. (such as USA, Chile, Canada, Mexico, Argentina, Bolivia, Colombia, Venezuela, Ecuador, Guatemala, Honduras, Nicaragua, Panama, Peru, Uruguay, Paraguay, Dominica)H27 is a portable 4G LTE SIM card WiFi router provides high speed Internet service , you only need insert a SIM card (big size ) ,then it will work . It is a pocket router , you easily put it in your pocket and enjoy WiFi Internet anywhere . With a removable big capacity battery, its WiFi can standby days . Support both 3G & 4G networks, support 10 WiFi users at the same time. Easy to use, easy to carry.Our 4G router / modem only support universal ordinary SIM cards. For some locked SIM cards, contract SIM cards which operators don't allow to use on wifi routers, or only allow to use on their authorized devices. This product might not work. (IF your SIM card can not access to Internet, usually you change another operator's universal SIM card, then it will work.) The router will automatically recognize most SIM cards and APN. if not, user can fill in APN information manually.Compatible devices: iphone, Android Phone, PC, game consoles , etc... all WiFi devicesIMEI CHANGE FUNCTION: login router IP: 192.168.100.1 and go to IMEI page write in a new IMEI, then you can change the router's IMEI *This is a hidden function for professional users to do tests, we don't suggest ordinary users to change device's IMEI to acquire cheap Internet traffic, and we won't provide technical support to such move.