On heat build-up, On the headphones, On the use – Sony NWZ-A818BLK User Manual

NWZ-A816SLV, NWZ-A816BLK, NWZ-A816, NWZ-A816WHI, NWZ-A815, NWZ-A818SLV, NWZ-A818, NWZ-A815BLK, NWZ-A815PNK, NWZ-A815WHI, NWZ-A815SLV, NWZ-A816PNK