Features:

Compatible with most of smartphone like for xiaomi, for iPhone, for Samsung, for huawei, etc.
The headphone can connect to two devices.
Support to display battery level on iOS system and some Android smartphones.
Noise canceling fucntion.
Operation guide:

Pairing:
Don't let it go after power switch, keep press to enter pairing mode(red and blue light flash alternately). Aterwards, smartphone can search the headphone and connect.
Mode set up:

Standby mode: Blue light flash every 5s when headphone is in standby.
Using mode: Blue light flash every 1s when headphone is in call status.
Specification:

Brand Name: HOCO
Model Number: EPV02
Driver: 9mm
Impedance: 16
Frequency Response: 20Hz-20kHz
Plug: 3.5mm metal plated
Cable Length: 1.2m
Microphone: Yes
Wire Control: Yes

Package Included:

1 X HOCO EPB04 Bluetooth Headphone

• Brand Name: HOCO
• Model Number: EPB04
• Charging Time: Less than 2 hours
• Talk Time: About 3 hours
• microphone: Compatible with most of smartphone like for xiaomi, for iPhone, for Samsung, for huawei, etc.

Brand Name: HOCOCoper