http://robosoftsystems.co.in/roboshop/index.php/wirelesscontroller/ps2-wireless-module.html

I guess the Rs 3000 worth 6CH HK Tx/RX available with Sai is a better option. much much longer range and true controller.

its range is just 30m/100ft. and can only control dc motors-no servos[has 2 wire output]
it can be used for a 8ch vehicle with motors and actuators

its just a simple on/off function RC.
No use for flying.
just useful to a limit in robotics only.

it is analog[proportional]
it has 4 2ch sticks[like some joysticks have 2 2ch sticks which i use with sim. it is proportional] similarly it is also proportional