Its included audio cable is equipped with a Play/Pause/Answer/Hang up calls button and a IP(international standard)/NK(national standard) switch. Connecting the audio cable with your headset, if your headphone appears unclear sound, only one side with sound or the microphone doesn't work, which means that it doesn't support your device, you should switch the IP/NK key.
Specifications:
Bluetooth version: 4.1
Product type: Dynamic headphone
Speaker diameter: 40mm
Microphone unit: 4 * 1.5mm
Speaker impedance: 32ohm
S.P.L.: 106Db S.P.L. at 1KHz
Frequency response: 20HZ-20,000HZ
Battery capacity: 400mAh
Battery type: Lithium battery
Charging time: 3hours
Talk/music time: Above 8hours
Standby time: 180hours
Transmission distance: 10m/33ft without obstacles
Operating voltage: 3.7V
Charging voltage: Below DC4.7V-6V
Line-in cable length: Approx. 1.2m / 3.28ft
Unfold headphone size: 19 * 19.5 * 7.5cm / 7.5 * 7.7 * 3.0in
Headphone weight: 260g / 9.2oz
Package size: 14 * 8.8 * 18cm / 5.5 * 3.5 * 7.1in
Package weight: 395g / 13.9oz

• CRYSTAL SOUND, WIDE FREQUENCY - decent sound, good detail, good clarity, wide frequency with balanced bass, median, high pitch to satisfy our daily audio demand, such as studying, listening to music and so on
• BROAD COMPATIBILITY, 2 LINK TYPE - can easily pair most of Bluetooth-enabled devices like smartphones, tablets etc. (transmission distance up to 10m). Also can connect with non-Bluetooth device by 3.5mm Audio cable
• EASY ACCESS, VOLUME/PHONE CONTROLLER - 4 buttons to power on/off, answer/hang up, reject/redial call, pause/ play, control volume/ track. A built-in remote Mic for your hands-free calls
• GOOD CRAFT, FODABLE DESIGN -size unfolded(7.5 * 7.7 * 3.0 inch) soft leather ear cups(inside: approx. 62x33mm) & adjusted headband for comfortable wearing, closed-back ear cup style for better noise-isolating, folding for easier storage.
• 8+HOURS PlAY TIME -built-in 400mAH rechargeable Lithium battery, charging about 3 hours through USB-connected Charger

CRYSTAL SOUND, WIDE FREQUENCY - decent sound, good detail, good clarity, wide frequency with balanced bass, median, high pitch to satisfy our daily audio demand, such as studying, listening to music and so onBenss