I pass over the fact that mine broke down on the first Loading ... Otherwise a poor bill of product: the buttons are tiny, the communication system with the user LED is rather opaque, the manual (a piece of paper of 10 cm × 8 cm written in small print in English on one side, Chinese on the other) is not complete nor very clear. The helmet is really very basic. In fact, this is not bad in itself (proper playback of MP3, size reduced autonomy, sealing, etc.) but we expect to find more in a market or in an automatic pool distributor that By next 30 real brand products!