PVC (EN71 compliant) waterproof pouch Integrated stereo speaker 1W Compatible with iPod, iPhone, MP3, ... (guaranteed). 2. Double PVC zipped strongly to secure 100% waterproof. 3. Integrated stereo speaker, 0.5-1 watt. 4. On/off ... button. 5. Powered by highly miniaturized amplifier (patented). 6. 3.5mm digital jack. 7. Compatible with iPod, iPhone, MP3, MP4 ...