2 Channel DVR HD Mini Recorder

I still have the bullet cameras fitted on my BMW R1200GS motorcycle that I haven't used much over the last 12 months.  Preferring to use the Drift Hd cameras......

I saw this 2 channel DVR HD recorder off Ebay:  Thought of replacing Sony Camcorder and recording upto 720p quality on a SD Card.  Well managed to record some footage, but there was an annoying audio feedback and now the video out does not work.  I have asked for money back........
Worth a try: