Bro I bought all from Dubai, All this package cost me 100 Dirhams (Rs 2700/- appox.) installation Rs. 500/-, I get it install from Dubai Autos Sadar Rawalpindi.
Regarding the battery consumption it is only active when you put the car in reverse gear, so I think it will not effect the car battery.
Secondly this all system is same which is installed by Suzuki Motors in Dubai there they gave a car called Suzuki Celerio.