Product Information:Product parameter1) Driver: 15mm2) Impedance: 32 OHM3) Bluetooth version: Bluetooth v4.1 EDR4) Bluetooth use frequency band: 2.4GHz5) Power level: CLASS II6) Output power: 30mW7) Bluetooth distance: 10 meters without barriers8) Frequency response: 20-20000Hz9) Operating voltage range: 3.0V-4.2V10) Microphone sensitivity: -42dB11) With A2DP/AVRCP high-quality stereo audio transmission and remote control protocol12) Powerful noise cancellation circuit (active noise reduction)