Jiofi is best 4g dongle which has a single sim card slot it is goodongle and has a average battery backup it is small in size eazy to carry out with us it is best and cheap in class available online and and in local shops it also has warrenty of 2 years which covers hardware and software problems the battery backup can be even better but keeping price in mind its a good product but it only supports jio sim and not other sims like airtel idea etc