The headphones use Protein leather that is an artificial leather, a fabric intended to substitute for the many types of leather. 

The headphones fit well and close out a great deal of outside noise. The bass is strong and vibrant.

1. Pro-10 ： biased bass in the sound.

Pro-30 ： biased bass in the sound + upgraded protein memory ear muffs (enhanced passive noise reduction effect).

Pro-50 ： premium accurate sound（a detailed high-end and well-tuned mid range, crystal clear lows ）+ upgraded protein memory ear muffs (enhanced passive noise reduction effect) + luxury package.

2. 1, Sound Performance:

- PRO-50：Neodymium magnet, a Japanese voice coil and Japanese driver diaphragm

- PRO-10：A Taiwan voice coil and Taiwan driver diaphragm

2, Ear Cushion

-PRO-50: The memory-protein earmuffs is Made in Germany.

-PRO-10: The high quality padded ear cushions.

3, Package

-PRO-50: Exquisite package with carrying case.

-PRO-10: OneOdio Standard package.

1. Please confirm whether your music is unilateral.

2. Please make sure that the audio cable is plugged in properly.

3. 3. Clean the dust or impurity of the plug.

1. Make sure the audio cable is fine, and make sure that thecable is plugged in properly.

2. Clean the dust or impurity of the plug.

1. Please use the charger below 5V to charge the headphones.

2. The indicator light is red when charging, and then the red light turns blue, indicating that it is fully charged. Make

     sure that the headset is fully charged. 

1. Before pairing a device, make sure the headset is notpaired with another device already, and the headset is in  the pairing state (the indicator light flashes alternately red  and blue).

2. Try to clear the Bluetooth history paired record on yourdevice and search for our products again.

3. Our headsets have a wide range of compatibility. Somedevices cannot be paired with other Bluetooth headsets  due to their own compatibility, such as Sony devices. When  some special devices cannot pair with our headsets, we recommended that you first contact the customer service  of the devices.

1. In ideal environment like open field, the bluetooth connection distance will be over 10 meters. Due to the physicalcharacteristics of the Bluetooth signal itself, the Bluetooth signal may be interfered by the environment, the connection distance might be influence. Please try to change position of the headphones, and avoid thick covers,  microwave oven, ticket gates, other Bluetooth device or  places that generate electromagnetic radiation.

2. Signal interference may occur when a Wi-Fi® device is inuse near the unit if they both use the same 2.4 GHz  frequency band. Try to turn off the Wi-Fi function of the  connected device or use 5.0 GHz Wi-Fi.