Nunet Portable Voice Amplifier with External Loud Speaker for Teachers, Coaches, Tour Guides, Presentations, Salespersons, etc, Supports MicroSD, USB Stick or AUX Input, FM Radio, Voice Recorder Portable Super POWERFUL Voice Amplifier/Speaker, It makes your voice louder without stressing your vocal cords. 5W SPEAKER for great quality sound from FM radio, AUX, USB stick or MicroSD card. Play the sound and record your favorite program as well FM stereo RADIO, auto-search and save radio function. Multifunctional LED display, big size display screen, amplifying sound (Reverberation sound). MATERIALS: ABS (Sturdy, Durable and wearproof). Lithium battery: 2000mAh , standby time: 15 hours.