CAROL Bluetooth Amplifier_BTM-311VH The BTM-311VH is a multifunctional Bluetooth amplifier with Class D technology, allowing you to wirelessly recording video and audio from your microphone, smart phone, tablet or laptop. It is equipped with dual video output (HDMI/VGA) and supports multiple speakers hookup to optimize listening experience. This devices features adjustable bass and treble for customizable sound. It is a great option for meeting, lecture, home entertainment and education institution with its black and silver chassis design.