B922 Class B AIS Transceiver with WiFi & Bluetooth Wireless Connectivity - 2W CSTDMA. EM-TRAK B921 CLASS B AIS TRANSCEIVER - 2W CSTDMA MFG# 430-0001. Certified AIS Class B – 2W CSTDMA. SRT-AIS™ Transceiver Engine for superlative proven performance.
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