Brand N/A Model N74U Type Portable Colors Black Quantity 1 Material Plastic Internal Memory No Memory Card Type TF card Max Extended Capacity 64GB Media Format MP3 Total Power RMS 20W Impedance 8ohm Sensitivity 100Hz~13000Hz 000Hz +/- 1dB Channels 2 Remote Type N/A Interface DC power port 1 x MIC 1 x USB 2.0 port 1 x 3.5mm headset jack 1 x TF card slot Radio FM Radio FM Frequency 87~108MHz Power Supply 100-120V Built-in Battery 2000mAh Plug Type 2-Flat-Pin Plug Other Features Great for teaching tourist guiding selling etc Packing List 1 x Megaphone speaker 1 x 2-flat-pin plug power adapter (100~240V / 90cm) 1 x Head microphone (100cm-cable) 1 x Audio cable (59cm) 1 x Chinese / English user manual 1 x Waist band (64cm)