20Pcs Two Channel IIC I2C Logic Level Converter Bi-Directional ModuleFeature:Power supply :5V-3VAVCC connect to 5V system powerASCL connect to 5V system SCLASDA connect to 5V system SDAAGND connect to 5V system GNDBVCC connect to 3V system powerBSCL connect to 3V system SCLBSDA connect to 3V systems SDABGND connect to 3V system GNDPackage included:20 x Two Channel IIC I2C Logic Level Converter Bi-Directional Module