Features 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 Board Model: 6E2 Material: PCB, glass. Function: For level indication. Power Supply: DC 12V 1A Signal Input: ≤ 0.775V Package List 1 x PCB 1 1 x PCB 2 2 x Vacuum Tube 2 x Connecting Cable 1 x User Manual