I would use the analogy of a child and a harp. I like a child know the TCDS device aka harp can produce beautiful music. But with little to no instruction. and vague support, I feel left on my own to devise how best to use this device.
Not marked left or right. what are you to do with it? anode? cathode? nothing is marked. Absoutely no indications on what goes where? how to use it? are you kidding? even badly made chinsese products have some instructions - this is just REALLLY BAD!! Amazing how you can get away without any customer support, guide or instructions!!