Module for communicating between two system that are 30m and 4 walls away

hai all

which modules can we use to communicate between two systems which is about 30 meters away and there are 04 walls in between?
i think we cannot use 315/433/900 mhz modules.will it work with 2.4 ghz module?
is there any such modules are available in india?


thanking you


ml

2.4GHz. You can easily buy a wireless card.