1.FR-4 PCB with multi-layer for 6 2.Green solder mask,white silkscreen ... using for wide range of electronic products, such as project, amplifier, CCTV, power supply, GPS, Safety ,camera, set-top box, medical ... products meet RoHS standards.ROHS:A001C100827049001-2SGS:CANEC1000312001UL:E320045 power amplifier pcb board with gold finger