For firmware 02057 or newer. 1) Power the lower MECHA ON by pressing and holding the power button for 3 seconds. 2) When the green LEDs show: - = - = - = press and hold the button 1 until multiple beeps are heard, or press 3 seconds (one LED will blink). 3) Power the upper MECHA ON by pressing and holding the power button for 3 seconds. 4) When the green LEDs show - = - = - = press and hold the button 2 until multiple beeps are heard, or press 3 seconds (two LEDs will blink).
When the units are paired, the middle led of the lower MECHA and two LEDs of the upper MECHA should be lit.