... specific instructionMaterial:FR-4Layer: 2 layersSurface finish, HAL lead freeSolder mask: GreenSilk screen: WhiteThe othere surface finish ... Red, yellow, white, black, purpleProcessing:uses the SMT non-lead craft, meets the international environmental protection requirement.Optional housing ... materials: Aluminum alloy, ABS, or other materials.Lead time of prototype: 1. 10-15days, with customers ...