... with USB or TF card slot with headset microphone used for yoga,tour guide,teaching Item Name: ... 8 hours Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, BlueWeight 225g ( including battery ) ... Used for Yoga, Gymnastics,Teaching,Promotion Activitives Conference,Acoustic Instruments,Camping and other outdoor Entertainment Accessories: Headset Microphone ...