Used Sokkia GRX2 including all accessories and newly calibrated: Type: Dual-constellation GNSS RTK receiver Channels: 226 channels Signals: GPS, GLONASS, SBAS (some versions support Galileo E1) RTK Accuracy: Horizontal 10 mm + 1 ppm, Vertical 15 mm + 1 ppm Static Accuracy: Up to 3 mm + 0.5 ppm (H), 5 mm + 0.5 ppm (V) Wireless: Integrated UHF radio, Bluetooth, Cellular (GSM/HSPA/CDMA) Storage: SD/SDHC card support Protection: IP67 waterproof and dustproof Battery Life: More than 7.5 hours (typical static operation) Weight: About 1.2 kg including battery (1.0 kg receiver + 195 g battery) Operating Temperature: Up to −20°C to +65°C with battery installed