im looking for ideas on a 12v remote control plc setup

I have a plc that runs a countdown clock i made. I would like to start and stop this plc via a remote control device. I would like to get a solid reliable range of at least 150 feet if not more. I tried using a little 12v remote relay switch that i found off amazon.com but the range was just not long enough or very reliable. The switch I have is a momentary push button on off switch. I like it because i was able to push one button too start the program and use the other button to stop it.


Can anyone help me out with a better suggestion?

I would like to have a unit that has 2 or more channels for multiple items but at the very least 1 will do.

What about these from Schneider
Harmony XB5R - Ø 22 mm wireless and batteryless pushbuttons, they are piezo electric and have a range of 300m

http://www.schneider-electric.com/p...ons-switches-pilot-lights/60642-harmony-xb5r/

We have had good success with these:
http://www.controlchief.com/Default.aspx