... battery 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 ... aluminum and iron boron speaker. 9. Built-in rechargeable lithium battery, when the maximum playing, support for 5 hours. Android Robot mini ...