FecPecu Lossless Sound 4GB Bluetooth MP3 Player Hi-Fi 50 Hours Playback Music Player Expandable Up to 64GB (Green) Needn't to insert the headphone or speaker, you can enjoy favorite music and listen to FM radio with the Bluetooth mp3 player. Bluetooth support version 3.0 or above 50 hours playback's battery life, and only need to charge for 3-4 hours. You can charge it in computer or the general charger which output is "5V, 0.5-1A" The memory card slot can support 64GB, so can store more music or other files Clear lossless stereo sound, support audio formats: MP3, WMA, OGG, WAV, APE, FLAC, and ACELP (Not support Audible and WMA DRM directly) Shuffle favorite songs in any folder or playlist which you selected, enjoy shuffle fun