... 3. SD/USB/TF/FM 4. ODM OEM Android Robot mini Speaker Specification: 1, Frequency response: 90HZ-20KHZ2, Load power ... : 3W3, Distortion : ≤0.3%4, Speaker Unit: 40mmx25, SNR:> 85dB 6, Charging power: USB 5V 7, Power ... because of the comptitive price and good quality 6. Mini and protable can be takea nywhere 7. Support SD ... maximum playing, support for 5 hours. Android Robot mini Speaker