1.MP3 Play/ Speaker/siren(orMusic)/record Buit-in mic
2.USB socket to play MP3,built-in MIC
3.120 seconds big-capacity recording
4.Volume control,recycle play MP3.LED indicator
5.18650 rechargeable battery 1800mA included in body ,
6.1800mA battery support speak 10hours/MP3 play 5hours/siren 2hours .If you want to double playing time ,need pay more for 2500mA battery
7.attach rechargeable battery &recharger
8. extra-recharger base for 18650 is for optional
9. SD socket is for optional ,extra-mic is for optional
