Q4: Does not connect to bluetooth.
A4: 1. Please disconnect any other device that is connected to the headphone.The headphones (turn off Bluetooth on your paired device) will not be able to search if you connect to other devices.2. Please remove the audio cable from the headphone when using Bluetooth.3. The battery may run out.Please charge the headphone.
Q5: The built-in microphone cannot be used.
A5: The microphone with built-in headphone is only available with Bluetooth.You need to purchase a 4-pole cable with microphone (not included) or a separate microphone for wired use.
Q6: For better sound quality.
A6: 1. Adjust the sound quality with the equalizer.2. The sound quality is better when used with a wired connection.If the Bluetooth connection is unstable, it will affect the signal transmission and the sound quality may be poor, so try to re-pair it.(Headphone Driver Unit Specifications: Φ 1.6 inches (40 mm), 32 Ω)