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 8 GB.Get one and enjoy wonderful music / FM radio as you are doing sports. - Color: Red - Supports TF card up to 8GB - Supports MP3 music format - FM range: 87.5~108.0MHz - Built-in 100mAh lithium battery - Working time per charge: 3 hours - Comes with USB cable (43cm length)