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Model HBT-30 (P/N 42021G-01) · Dual Ear Over-The-Head headset · Hybrid Flex/Wire boom for precise microphone placement Model HBT-60 (P/N 42021G-03) · Listen Only · Behind-The-Head headset · Digital volume control International Variant: Model HBT-61 (P/N 42021G-04) Compatible with smart devices and BT dongles Series HBT Product Bulletin David Clark HBT Series Use And Care Information. 0 technology pairs seamlessly with virtually. Limitations on Effectiveness of NRR The David Clark H10-60 for Airplanes features: Headset Pressure Adjustment. Fire / EMS Series; Marine Series; Ground Support Series; Mobile Unit Series; Military Unit Series For more product information, please contact us. David Clark H6240-55 for Icom A6E & A24E. Select the department you want to search in. Model HBT-30 Over-the-Head, Dual Ear Behind-the-Head, Dual Ear Model HBT-60 Behind-the-Head, Listen Only Industrial BLUETOOTH ® HEADSETS. 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