Portable plug - in subwoofer sound $ 18.23 Interface type: Card reader Battery capacity: 800 Frequency response range: 100HZ-20khz SNR: 75dB Power supply: Built-in lithium battery Track: 2.1 Running Time: 2 hours Extended storage: 32GB Bluetooth protocol: 4.1 Number of speakers: 1 Effective distance: 10 m Functions: Card insertion, radio Operation mode: press the button Applicable people: General Shell material: metal Supported format: Usb flash drive Speaker adjustment mode: button
