(1) USB, TF card, FM, LED mobile phone speaker (2) mini phone speaker with li-ion battery, colorful and fashional mini mobile phone speaker Output(RMS): 3W*2 Frequency: 150HZ-20KHZ Impedance: 4Ω S/N: ≥85db Speaker Box Dimension(mm): L70*W45*H50 Power: DC 5V-USB Carton Dimension(mm): 515*422*225 Li-ion Battery: 3.7V 500mA Built-in: USB, TF card reader, with FM, LED display USB, TF, FM, LED display ...