€3 Bluetooth® 4.0 USER MANUAL ARTISTE Senior Headphone System aa TERSE Hus's sine Optical Audio In Tor smart TV. NFC Ease Pairing Adjustment of Tone Clarity, Selection of Treble Enhancement Sound: Balance Control {Left/Middle/Right) Microphone Button for Sound Amplification ® To protect your hearing, please do not use the headphones at high volume for a long time.