Features:
This KOTION EACH B3506 Bluetooth wireless headphone is equipped with Bluetooth 4.1 Version Chipset with up to 33 Feet of Range without obstacles. Hands Free headset, receive and make calls with built in Microphone function. Listen to your favorite music wirelessly.
LED indicator light, Bluetooth headphones with mic, Volume+/-(Previous track/next track), Play/Pause/Answer/Hang up calls with one button.
Lightweight stylish design with adjustable headband and protein leather ear cushion. Foldable design for easy storage. Take it anywhere you go.
3.5mm aux tangle free cable with a Play/Pause/Answer/Hang up calls button, USB to Micro USB charging cable and English manual instruction.
Compatible with many devices by connecting its included audio cable, such as for iPhone 6 / 6S Plus, for Samsung S5, S4, for LG, for Xiaomi, for iPad, for PC, laptop, for PlayStation 4, etc.

Specification:
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
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 / 3.93 ft
Unfold headphone size: approx. 195 * 180 * 75mm/7.67*7.08*2.95''
Headphone weight: approx. 250g
Gross weight: approx.280g

Note:
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.
Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully.
Please allow 1-3mm differs due to manual measurement.'