Need help with LMP keypad

Purchased a LMP keypad off ebay. Put in new batteries and tried to pair with my iMac 2010 running latest ML. No luck.

turn on keypad using slide switch on side of unit
press reset button on back of unit and green light on front blinks green
click on bluetooth icon on menu bar then setup bluetooth device
iMac finds the keypad and gives me the 8 digit pairing code
enter code and press enter key
after a short wait get error code that pairing was un successful.

any ideas anyone??

I did notice some of these units have a push button instead of slide switch on side for on/off.

wanted to add a screenie of the error I get after the 2 screens above.