The following information comes from the manufacturer:?- MP3 <br />- FM Radio- Memorey storage is 1GB?<br />- Built-in microphone for voice recording <br />- LED indicator <br />- Stylish and portable <br />- Long working life <br />- High durability <br />- Easy to use- Features a 2.5mm Audio Jack                                                                                                                                Earphone Output: 11mW(L) + 11mW(R) (32ohm) <br />Power: 230mAh Li-Ion battery <br />Audio frequency range: 20Hz-20KHz <br />S/N Ratio: >85dB <br />Max. Playback Time: >7 hours <br />Support Windows 98SE/ME/2000/XP、 Linux or Mac Os <br />* Available capacity will be less <br />* Reported capactity will vary <br />* Actual battery life will vary with use Package Contents USB MP3 Pen + FM Radio + Voice Recorder <br />Earphone <br />Driver CD <br />AC adapter <br />USB extended cable <br />User's Manual <br />Dimensions: 5.91 in x 0.71 in x 0.79 in<br />Weight: 7.80 oz