This is Shenzhen Smart Electronics Co.,Ltd ,which is engaged in PCB and PCB assembly manufacturing. We offer one-stop service for PCB/PCBA/FPC/Clone boards/Stencil/Membrane switch/Aluminium Heatsink/Electronics Component . 3*4 4*4 Matrix Switch Keyboard Keypad Array Module ABS Plastic Keys 4x4 3x4 12 16 Key Button Membrane Switch DIY Kit | ||