... voltage protection on Port 1 (7-pin Lemo)• Rechargeable, removable 7.4 V, 2.4 Ah Lithium-lon battery in ... tick approvalCommunications and Data Storage• 3-wire serial (7-pin Lemo) on Port 1. Full RS-232 serial on ... Port 2 (Dsub 9 pin)• Fully integrated, fully sealed internal 450 MHz receiver ... , and 10 Hz positioning• CMR+, CMRx, RTCM 2.1, RTCM 2.3, RTCM 3.0, RTCM 3.1 Input ...