Feature:1. More Than One: Including 2pcs PCB, 2pcs vacuum tube and 2pcs connecting cable, which enables good connection signal.2. Better Effect: The electron tubes have high brightness, so the dual channel level indicator ensures clear indication.3. Reliable Work: Works with higher efficiency under DC 12V 1A power, the signal input is less than or equal to 0.775V.4. Practical Use: Suits for DIY enthusiasts, can be applied to audio, industrial indicating equipment, instrument, etc.5. Easy to Install: Comes with a light weight and a compact size, the whole installation is very convenient to complete.Specification:Item Type: Vacuum Tube Driver BoardModel: 6E2Material: PCB, glass. Function: For level indication. Power Supply: DC 12V 1ASignal Input: 0.775V.Package List:1 x PCB 11 x PCB 22 x Vacuum Tube2 x Connecting Cable1 x User ManualNote:1. Please check whether the wiring is correct before powering on.2. Do not touch the circuit board at will after the connection. 3. The power supply voltage should not exceed 13V.