... 1w, 2w.4. 1+X multi-module communication units. 5. PCC Radio module (optional) compatible with Trimble/Leica RTK.6. Double battery ... , made in China (standard configuration) Radio frequency bands 440 MHz, with 100 flexible switching channels 2. External PCC radio (ADL Vantage) (optional ... temperature: -45~+65 Storage temperature: -55~+85 a lasted advanced multi-channel, multi-frequency RTK GPS system