Trimble R6 Model 4 GPS GLONASS 450-470 MHz Rover Receiver Trimble R6 Model 4 GPS GLONASS 450 - 470 MHz Rover Receiver - CMR Inputs - CMR Outputs - RTCM Inputs - RTCM Outputs - Data Collector - Binary Outputs - Data Logging - Bluetooth - L2CS - Cellular - L5 - Enable GLONASS - Login Required - Software Version 4.90 - 450 - 470 MHz Radio Module P/N: 64235-66 - Serviced By A Trimble Authorized Service Center