Is there a procedure for pairing this product to the USB dongle? Product worked for about 4 days, then suddenly stopped recognizing input. Tested on various machines, this Air Mous...

Is there a procedure for pairing this product to the USB dongle? Product worked for about 4 days, then suddenly stopped recognizing input. Tested on various machines, this Air Mouse / Keyboard is inoperable. Indicator lights green on key presses, but device does not respond, no air mouse or keyboard function. Pressing the Android button shifts light to blue, still no function. Tested various batteries and USB ports. Tested other RF keyboards and air mice, only this device fails to function -- does not appear to be issue with end-user hardware. Any assistance or link to operation manual is appreciated, thank you.