... and FM radioSupporting TF card or USB for music ( mp3 format ) ( USB 2.0/1.1 )With USB ... Battery working time Keep working in 7-8 hours Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack, ... Application: Used for Yoga, Gymnastics,Teaching,Promotion Activitives Conference,Acoustic Instruments,Camping and other outdoor Entertainment Accessories: Headset Microphone ...