13.2 Probe options: Convex probe linear probe Micro-convex probe R20 Phased array probe Trans-vaginal probe 4D volume probe 13.3 Optional accessories: Thermal printer, puncture guide frame, gel warmer etc. 13.4 Standard warranty period: 2 years, including machine and probes 13.5 Life-long maintenance after the expiration of the warranty period, and free upgrade and maintenance of the workstation software involved