Did not function for me but fully refunded by seller.
This is an amended review. The item did not work from new for me but Mobspares contacted me after my poor review and maintained a good communication link to me. In short, they arranged for the item to be returned to their uk base, to be sent to the factory for full assessment. They are issuing a full refund to me. I congratulate them for customer service and although I am disappointed the unit did not acheive a benefit for me, I feel it fair to withdraw my original 1* score and write this amendment with 3* based on their helpfulness.