The only way to know is for your friend and you (to help them) is to go online and look for sales at local stores, online sellers, etc..
Find speakers that are within the 5000 INR budget then look for reviews for those speakers.
Then look at the applicable manufacturer User Guides/Manuals along with manufacturer website FAQs and Forums.
Bluetooth can be tricky so read carefully - details matter.
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And take a close look at the actual devices and connections to be made. TRS (Tip, Ring, Sleeve).
There are different speaker connections being used and some are proprietary and may not work well together.
FYI:
https://www.cablechick.com.au/blog/understanding-trrs-and-audio-jacks/