... saving ,Safety ,and Longevity 1.Product Parameterrgb channel letters Product BrandTop CraftsmanPlace Of OriginDongguan China(Mainland)Material ... 5-7lmWarranty1year 2. Detailed Product Description rgb channel letters is our PATENT product.(1).These are ... used in many places, such as shop signs, bank signs,hotel signs,hospital signs,school signs ,advertisement, architecture, decoration, exhibition, and ...