one/computer or other audio system●Frequency range: 2.401-2.480GHz●Distortion factor: ≤1%●Frequency response: 20Hz-20KHz●SNR: S/N≥;95●Charging Time: 2.5hours●Bluetooth name:Jianrong 3.0●Speaker unit: 40mm *2, White magnetic speaker●ANC frequency:100-1000HZ●ANC level :15-20dB●accessory: Mini USB cable, ;3.5mm audio cable●4Colors: Black, Blue, Black and White, RedFunction characteristics: Certificates: CE,ROHS,FC Transmission distance: 10m Frequency Response: 20Hz-20KHz Charging Inter