... ,multilayer PCBA 3)Good after-sale service Controllers for 1in1 Air conditioner pcba factoryPCBA specific instructionMaterial:FR-4Layer: 2 layersSurface finish, HASL ... , HAL, Gold plating, Chemical silver, etc.The other solder mask type we could do are: Red, yellow, white, black, purplePCBA&SMT ... partner company in 2009all over the worldwithin 10-20daysProduction workshop Air conditioner pcba factory