It is a device through which you can connect your phone means by wifi while the device act like a hotspot.
the things you get in the box:
1 jiofi
2 usb for charging
3 adapter for charging
4 warranty paper
5 battery
You have to purchased a jio sim also recharge it and than put in the device . there is no connection issues at all.
you get 247 customer-care services.You can also call through it .The best thing is that you are online 247. You can connect to computer also for internet .the speed id not dropping at all.