This is a 2 layer circuit board smart home electronic lock. UL certified ShengYi S1141 FR-4 tg130, 1.0mm board thickness, 1 OZ(35um) copper thickness, Immersion gold finish, green solder mask and white silk screen. As it is a small board, the PCB delivered by panel 20*3=60 PCS per panel. The outline profile use stamp hole and CNC rounting. All the production complay with RoHS requirement.