... after-sale service Electronic Fan PCBAPCBA specific instructionMaterial:FR-4Layer: 2 layersSurface finish, HASL lead freeSolder mask: GreenSilk ... electronic assembly&pcb electronicProcessing: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 ...