I recently bought a shower speaker from fabfurnish.com worth Rs.3,490..Does anyone know how to install this speaker exactly??
this is how it looks: 
Shower – How to install shower speaker
shower
Related Solutions
If your shower curtain can reach to the wall of the bath surround, a combination of shower curtain clips:
and splash guards should prevent most of the water from escaping your tub.
Drain covers are specific to the tile drain manufacturer and can be difficult to find. Yours, however, looks to be of a common type and is very much like the middle one in this picture. I would take careful measurements and make a paper and crayon "rubbing" of your drain frame and go to the best plumbing supply shop in town (try a really good tile supply shop as well).
This is a website you might try: https://www.plumbingsupply.com/draincovers.html
It is odd that there are no screw holes in the drain scupper, the cut-outs in the tile frame are made to provide screw clearance. There is a chance that your tile guy tiled in a drain frame that was not the style meant for the actual drain assembly. If that is the case you may have to resort to a "snap-in" style retrofit cover. They never look as nice as the original but it's better than an open hole.
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Best Answer
Reading the information on that page and interpolating a bit:
This is a Bluetooth speaker in a waterproof case, plus a modified shower head that it can lock into. Remove the existing showerhead and replace it with the new one (the big object). Charge the speaker (the small object), turn it on (the button), and pair it with a device that can play to a Bluetooth headset/speaker/whatever. Confirm that it plays, then mount the speaker into the showerhead by pushing it into place and rotating 30 degrees (twist-lock). When you're done using it, push the button to turn it off and save battery power.
Note that if you don't have an MP3 player or radio that speaks Bluetooth, or some other way to get the audio into Bluetooth radio packets, you can't use this speaker.