Thank you for viewing. Apple A1446A 16GB Operation confirmed. Music synchronization OK (confirmed in Mac environment). FM radio also works (earphones act as an antenna). Bluetooth connection also confirmed. Operation buttons seem to be working fine. Regarding the battery, it works perfectly even after playing through an entire album. Charging is via a Lightning cable. However, there is a point to note. With TRRS type earphones, such as Apple's genuine earphones with a microphone, the left channel audio is not output. You can listen without any problems with normal TRS earphones. It's compact and convenient to have for everyday running or as a disaster preparedness item in case of earthquakes, etc. Please check my profile for further information.