Brand N/A Model WS-980 Type Mini Colors Black + translucent Quantity 1 Material Plastic Internal Memory No Memory Card Type USB flash drive / TF card Max Extended Capacity 16GB Media Format MP3 Channels 2 Remote Type N/A Interface USB 2.0 / TF card slot / Mini USB / 3.5mm Radio FM Radio FM Frequency 87.5~108MHz Power Supply Built-in Rechargeable Battery Built-in Battery External 500mAh battery Total Power 2 x 3W Impedance 2 x 4ohm Signal to Noise Ratio(SNR) >=75dB Sensitivity 85dB +/-2dB Packing List 1 x Speaker 1 x Battery 1 x USB / 3.5mm cable (45cm)