Mini SD TF Portable MP3 Walkman Black Player

Storage capacity: no memory , you need to Insert a TF (Micro SD) memory card with your mp3 files, Size: 4.2cm x 2.8cm x 1.3cm(LxWxH) – Supported audio formats: MP3 – Battery Type: Built-in high-energy rechargeable lithium battery, for 4 hours of continuous playback.