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U used to activate the call of the PTT button u transient or normal u green LED indicates the active microphone u stable metal base, with 2 meters long cable and can be locked ou u connection device provided by the power amplifier phantom power spot leadtek microphone is an elegant fashion high quality desktop single directivity capacitance, cylinder is mainly used to call in a public broadcast system. It is equipped with a stable gold base and rubber foot, which can maintain reliable stability on any flat surface. In addition, the unique design also enables the device to be flat embedded in the table. The basic function PTT (press and speak) key not only turns on the microphone, but also provides priority contacts compatible with the belle series power amplifier. The switching feature of PTT key can be internally configured as PPT mode (press and speak) or switching mode (press and open, press and close again). It is equipped with a 2 meter long flexible cable and a 5 pin European connector for connecting balance signals and priority contacts. If no priority contacts are required, a power amplifier with a 3-pin european-style connector can be connected. The green LED indicates whether the microphone is active. Control and indicator light ? PTT key ? PTT status LED indicator certificate and approved safety compliance with EN 60065 standard anti-disturbance compliance with EN 55103-2 standard radiation compliance with EN 55103-1 standard area certification European CE