1. Black solder mask 2. Multilayer 3. Certificate:UL, ROHS, ISO9001:2000 4. Lead-free HAL 5. Min. hole: 0.2mm Multilayer pcb1. Black solder mask2. Multilayer3. Certificate:UL, ROHS, ISO9001:20004. Lead-free HAL5. Min. hole: 0.2mm PRINTED CIRCUIT BOARD1) Gold-flash coated 2) Double-sided PCB3) With milling cavity for chip-on board selectable4) UL, ROHS CERTIFICATE