Since I have had a few AR's I will try to offer an opinion. 1. Does it work? 2. Can you take a photo? 3. Can you describe the switch that turns the unit on and off because that should tell which model it is. 4. I will say this; the value is dependant on how old a model it is. The older XA XB's are not worth much maybe 75.00$ in good condition. 5. Look on E-Bay and see if you can identify the model from pictures and see what they sell for. Hope this helps,J.R.