Sennheiser IE 4 Earphones : Product Description
When the smartphone is connected to the car audio system, the sound may be interrupted.
It is necessary to check whether there is any problem with the smartphone or car audio used. Still, it can be solved by ” clearing the cache” (for Android) with the smartphone or “deleting device information” on the setting screen In some cases.
In some cases, the file cached by the device OS update may be damaged, and the Bluetooth connection may not be appropriately established.
In that case, clearing the cache will remove the offending file, recreate the correct folder, and ensure a successful Bluetooth connection between your smartphone and car audio.
Check that the main unit lamp blinks blue and red alternately, or that blue blinks twice consecutively.
Hold down the “power” button or “PAIRING” button on the headphones until the lamp on the central unit blinks (about 7 seconds).
There are the following two patterns for the lamp blinking.
The blue lamp blinks twice each time
Blue and red lights flash alternately
Refer to the instruction manual as it varies depending on the model.
* If you are asked for a passkey, enter “0000 (Zero Zero Zero Zero)”.
A passkey is sometimes called a passcode, PIN code, PIN, password, etc.
This completes the pairing process with the headphones.