Portable card wireless mini speaker $ 17.37 Connection method: Bluetooth connection Interface type: USB Battery capacity: 1200mAh Frequency response range: 100HZ-20KHZ Output power: 3W Signal to noise ratio: 75dB Power supply mode: built-in lithium battery Channel: 1.0 Play time: 8 hours Expansion storage: 32GB Bluetooth protocol: 4.0 Effective distance: 10 meters Function: insert card, radio Operation mode: button
