This is a very handy router which uses the sim card only the reliance jio sim card to connect with the internet and then spreads the wifi signal to the nearby devices.
the speed of ISP depends on the service provider as for this Reliance jio is the service provider thus the speed was good when the sim was launched but due to heavy traffic it is not that great.
the good feature of this product is that it automatically goes to the sleep mode when there is no device connected to this router and it saves battery, but sometimes it is irritating that you have to again and again turn it on when you go offline for sometime unintentionally.
talking about the battery the batter is average gives around 3-4 hours of battery power with constant use of the wifi.