... TF USB function 3 loud voice ,2000 mAh 4 with reverberation 5.with headset,adapter,belt megaphone Key Specifications 1, material plastic2 ... U flash disk,sd card,FM .Suitable for devices equipped with a 3.5mm audio jack, including cell phones, MP3 players ... .5308,7503.3 For more new-developed items, please contact with usOEM and OED order is welcome!Thanks! multi-functional Megaphone