As far as I know the model has never been used. I have tested with a 9 volt battery and it runs well. I am narrowing my focus to only the RGS and selling equipment that did not run on the RGS. I am not a dealer and just looking to find good homes. I will do my best and work with buyers to combine shipping if they are interested in purchasing multiple items. Please feel free to ask questions. Thanks for checking out my items.