Model ST-605 Type Mini Colors Deep Pink + Silver Quantity 1 Material Aluminum alloy Internal Memory No Memory Card Type TF Max Extended Capacity 16GB Media Format APE / MP3 / WAV / ASF / OGG / WMA Total Power 2.0W Impedance 4ohm Signal to Noise Ratio(SNR) >/= 90dB Sensitivity 450mV Channels 2 Remote Type N/A Interface 1 x 3.5mm plug / 1 x Micro USB / 1 x TF card slot Radio FM radio FM Frequency 87~108MHz AM Frequency No Power Supply Built-in rechargeable battery Built-in Battery 350mAh Plug Type USB Packing List 1 x Speaker 1 x USB cable (30cm) 1 x Strap (19cm) 1 x Audio cable (50cm) 1 x Chinese user manual