I found more information about Jio Dual Band Router..
-- One, if you take the Jio GigaFiber connection as part of Preview Offer by paying
Rs 2500, you will get a connection with speed of up to 50mbps. In contrast, with the Rs 4500 Jio GigaFiber connection you get speed of up to 100mbps.
-- Two, you will get a
single-band Wi-Fi router that supports 2.4Ghz connections. This is basically fine for small houses or if you are going to use the connection only within a room or two. But do keep in mind that with the
Rs 4500 Jio GigaFiber offer you get a
dual-band Wi-Fi router.
Source:
Jio GigaFiber now available with Rs 2500 security fee but there is a catch and Rs 4500 offer still better