1. PCB materials: FR-4
2. SMD: LEDs, resistors, connector, LCD, LED displays, sensor, speaker
3. Lower resistance and higher conductivity
4. Soldering many different kinds of components
5. Thru-Hole technology to utilize both sides of PCB
6. Plating Type: Gold, Tin-Lead, Nickel
7. PCB layer: Single-sided, double-sided, Multi-Layer design
Tactile and non-tactile with a metal dome or polyester tactile domes.