4-layers-blue-tooth-earphone-board (4-layers-blue-tooth-earphone-board )
Category: Printed Circuit Boards (PCB)
1 Number of Layer: 1 to 20 layers.
2 Base Material: FR-4, CEM-3, Teflon, Aluminum Substrate, Halogen Free, High Tg.
3 The color of soldermask and silkscreen ?Green,White,Black,Blue,yellow etc.
4...