Wireless bluetooth speaker subwoofer

Type: Bluetooth speaker
Connection method: Bluetooth connection
Battery capacity: 4000
Frequency response range: 60Hz-15KHz
Power supply mode: built-in lithium battery
Channel: 2
Play time: 6 hours
Expansion storage: 32GB
Bluetooth protocol: 4.1
Operation mode: button
Play format: MP3
Shell material: metal
Power supply mode: USB