• Listen to Audio Devices with comfort and privacy
• In-Line Volume Control
• Built-in Power Amplifier to Enhance the Audio Output Level
• Switch Off Built-in Amplifier To Power Speaker Directly

Volume: Adjust To Desired Audio Output Level
Amplifier On / Off: Switch On To Increase Audio Output Level
Note: Install One AAA / UM-4 / R3 Battery (Battery not included) To Power
the Optional Internal Audio Amplifier Only Connect To Headphone Jack,
As Connection To Higher Output Speaker Connection Will Cause Damage.