... -in flash memory (optional) 2.. Built-in TF card slot, can be as card reader 3.Build-in stereo FM radio 3 ... high-fidelity 10. Latest class D digital amplifier 11. Audio line-in for MP3 player connectivity, MP3, MP4, mobile phone, PC ... (0.4A-1A) power adaptor, use USB power supply.4. Battery: Nokia li-ion battery and disassemble, can play music while charging.Basic ...