LDW931-2 is a 4G SIM card USB wifi router,with very cool leopard eye design , it takes power through USB port , work as wifi router also can be pluged into computer USB port , work as USB modem plug&play , doesn't need CD driver Pls make sure your computer's antivirus software or Firewalls allow the USB modem driver to install ,otherwise it can't work as USB modem Once you insert SIM card , it will provide you WiFi Internet automatically The package does not include SIM card , you need buy a NANO SIM card from local operators to use this device High speed LTE Chipset, Support TDD-LTE/FDD-LTE/UMTS/ networks Multi languages Plug&Play,No need CD-ROM,No Driver Installation Up to 10 users access to WiFiEurope version :4G LTE FDD: B1/B3/B7/B8/B20 ;(2100MHz)/(1800MHz)/(2600MHZ)/(900MHZ)/(800MHZ)3G:B1/B8Europe version works in most areas of Asia ,Africa ,middle east too (such as Russia, Spain, Ukraine, France, Belarus, Poland, Germany, Italy, Portugal, UK, Ireland, Switzerland, Finland, Sweden, Norway, Iceland, Denmark, Latvia, Lithuania, Czech Republic, Slovakia, Hungary, Austria, Holland, Belgium, Luxembourg,Romania, Bulgaria, Serbia, Albania, Greece, Slovenia, Croatia;Korea , Japan, Israel,Turkey, Malaysia, Singapore, Azerbaijan, Georgia,Australia, Saudi Arabia, Qatar,United Arab Emirates, Pakistan,Kuwait;Brazil and other African ,Asian countries )You can check frequency bands in below link ,https://www frequencycheck com/countriesIMEI change function:loginhttp://192 168 0 1/index htmlimeiSettingand write in a new IMEI , then you can change the router's IMEI This is a hidden function for professional users to do test ,we don't advice ordinary user to change device's IMEI to acquire cheaper Internet traffic , and won't provide technical support to suchmove Super tiny 4G USB dongle ; Innovative Nano SIM-in-USB technologySupport Win2000/2003/xp/Vista /Win 7/Win 8/Win 10/LinuxPower input :5V1AWorking temperature : -10C~45CColour:blackMaterial:plasticSize:88 x 28 x 12 3mmPackage Contents:1 x 4G USB WiFi modemOnly the above package content, other products are not included Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing The measurement allowed error is +/- 1-3cm