wireless communication

Hello sir;
i want to control some devices which about 1.0 to 1.5 km for from my office .
I want to control this device through computer which is at my office . How i can control this.

Please response as soon as possible thank you!.

Have a look at http://www.sunrom.com/rf-transreceivers/rfm12bp-433-mhz-transreceivers-2km-range