Universal one-sided mono earphone, contains one unit, provides sound in high quality and tone, one-sided model, built-in microphone to answer phone calls, accompanies USB cable to charge it. -Communication: Wireless Bluetooth-Control button: Yes-Volume control: Yes-Active noise-canceling: Yes-Sensitivity: 120 5dB-Frequency response range: 20 to 22,000Hz-Microphone: Yes-Bluetooth version of the headset: V4.1 + EDR-Radio frequency: 2.402-2.480GHz-Transmission power: Class2-A2DP support: music playback (audio output: 35mW, Play / Pause) -Transmission range: 10 m-Power of charge :( about 2 hours/voltage of charging 3.7V) USB-Speech time of 2 hours-Music playback time approximately 30 minutes to 1H-Type of Battery: 50mA rechargeable lithium battery-Dimensions: 3cm x 1.7cm x 1.2cm