Model MF Quantity 1 Color Silver Material ABS + aluminum alloy Key Number 90 Connection Method Wired Power Supply USB Battery Capacity 1500mAh OS System Windows / Android Other Features Foldable binaural speaker Theoretic power: RMS 3W x 2 (THD + N = 10% F0=1000Hz); Impedance: 4 Ohm; SNR(Signal to Noise Ratio): >=75dBA; Sensitive: USB 800 +/- 50mV (THD+N=1%) AUX 500 +/- 50mV (THD+N=1%) Speaker unit: Each channel 50mm 4 ohm; Supports max 64GB TF card; With volume control; Interface: USB 2.0; USB keyboard and speaker 2-in-1 foldable design perfect to save space and convenient to carry; Supports storage disk (SD / TF / flash disk); Suitable for computer mobile phone tablet MP3 MP4 etc. Packing List 1 x Keyboard with speaker 1 x USB cable (103cm) 1 x Audio male to male cable (103cm) 1 x Remote control (1 x CR2025 included) 1 x Chinese / English user manual