through hole led channel letter 1.Great luminance 2.High effectiveness 3.Energy saving ,Safety ,and Longevity 1.Product Parameterthrough hole led channel letter ... can offer atransformers to you,but you should pay for them(output 5V,25USD,output 12V 40USD).(8). Ametabolic ... signs,school signs ,advertisement, architecture, decoration, exhibition, and lighting, etc .6.Our advantages(1).We are one of the ...