Sports USB rechargeable MP3 player headset is very convenient extremely well built and very comfortable. You can enjoy music/FM radio at any moment without headphone cable. The radio comes with good volume long lasting battery and is very flexible. Very useful TF-SD Card slot supports up to 32 GB. Get one and enjoy wonderful music / FM radio as you are doing sports. Model No Type Sports MP3 player headset Quantity 1 Color White + green Memory Type Expansion storage Memory Capacity Supports up to 32 GB Expansion Slot TF / Micro SD Audio Format MP3 / WMA Battery Type Built-in Battery Capacitity 100 mAh Additional Features FM: 87.5~108MHz; Frequency response: 20Hz~20kHz; SNR: 86dB; Working time: Approx 3 hours Packing List 1 x MP3 player headset 1 x USB cable (59cm)