Power Megaphones (Hand Mike) Show ER-66 USB Series With Recording and Built-in Siren (White)

All functions can be operated on the extra-mic:
including USD/SD slot to play
3.5mm stereo AUX input(connect to Mobile , player...) ,
with recording (has no time limit,recorded file based on SD/USB capacity,output to SD );
three tone Alarm(119/or 110 police siren,whistle,car "ba ba "sound) for optional;
volume control , file forward / back;
the price is not included rechargeable lithium battery;
Additional rechargeable Lithium battery for optional;