About Product:Brand: arts zhuo time to market: in 2018, shenzhen source categories: physical types: bluetooth speaker connections: bluetooth connection interface type: USB battery capacity: 0 frequency response range: 60 hz-20 KHZ output power: 15 w power supply mode: need to match the cell broadcast time: 8 hours expanded memory: don't support bluetooth protocol: 4.1 the horn number Effective distance of 10 meters function: voice prompt, card mode of operation: key applicable people: a general display: no shell material: metal support APP: is supported formats USB speakers adjust way: button if there is a radio: no enclosure