built-in microphone
Passive noise filter
Bluetooth Version: 4.2
Supports profiles: HSP, HFP, A2DP and AVRCP
Frequency response: 20Hz – 20KHz
Impedance: 32Ω ± 2Ω
Headphone sensitivity: 110dB ± 3dB
Microphone sensitivity: -42dB
RADIO FREQUENCY COVERAGE: 2.402GHZ~2.480GHZ
Operating range: up to 10 meters
Battery: Rechargeable lithium, 3.7V, 250mAh
Charging voltage: DC 5V/500mA
Charging time: 2-3 hours
Operating time: Up to 8 hours (medium volume)
3.5mm Audio In
Color: Black
Warranty: 1 year