Very Good. Exchange given correct, capacity consistent with my choice and description. The key in use for three months does not give a worrying sign, plastic looks solid on the contrary, the protection of the connection is simple and effective, it is rather more aesthetic which does not spoil anything. I use it in my system my Multimedia Renault for listening to music, as I will like it beep when the power failure to avoid forgetting prominently on the dashboard, but I have not found that has the alarm. Conclusion good product and good price / quality ratio