... PC.Product Features1. BD970 mother board of Pacific Crest, a Trimble Company, multi-satellite, multi-system kernel.2. Built ... 1. External radio, made in China (standard configuration) Radio frequency bands 440 MHz, with 100 flexible switching channels 2. External ... environment: Working temperature: -45~+65 Storage temperature: -55~+85 a lasted advanced multi-channel, multi-frequency RTK GPS system