... optical sensor, scratch-resistant, durable, blue background light. 4.Support professional access control, and one user, multi-users combination door ... RS485,TCP/IP(optional),USB(optional)9.Support Wiegand 34, dry contact output 10.Support real-time records collection. Item DescriptionSensor SM ... 20%-90%(no dew)Size 180mm×130mm×30mmColor Dark(can by customized) Note: MX600 refers to RS232/485 port. MX601 ...