American Audio DB DISPLAY MKII LED Decibel Level Display and Amp Rack LightshowThe all metal DB DISPLAY MKII decibel display from American Audio is great for monitoring your sound volume. It also creates a great lightship in your amp rack. Make sure your speakers stay in great shape by keeping those dBs under control through this monitoring system. The LED display progresses from green through amber, to red. There are two different operating modes: Dot or Bar. A 5V power supply is included so you can get the unit plug in an