I have the sound after removed from the ignition key. The sound occurs after 1 minutes and increases in intensity until a maximum then decreases to zero. The sound is heard about 2 minutes.
When the ignition its on hear a short beep on speakers. Why not hear everything a short beep when removed from the ignition key. Hear the sound that bothers me in BT adapter. If you remove the adapter, not the sound is heard. BT adapter may emit a sound so annoying? With the Nokia 3100 holder were not problems when I use your carkit THB Bury System 8.That bothers you do not hear sound in car speakers .
Please tell me if you know what this sound is disturbing after removed from the ignition key.
The link for BT adaptor its :

The carkit link its :