For demanding applications of solid u used to activate the phone call "as the" key u transient or normal u green LED indicates the active microphone u sedate metal base, with 2 meters (6.56 feet) long cable and lockable Europe type connector leadtek microphone is a high quality of rugged desktop single directional moving coil Cylinder, mainly for the call in the public broadcasting 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) button not only opens the microphone, but also provides priority contacts that are compatible with the belle series power amplifier. The switching feature of PTT key can be configured into PPT mode (press and speak) or switching mode (press and open, press and close again). It is equipped with a 2 m (6.56 ft) long flexible cable and a 5 pin European connector for balancing 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 components and indicators • PTT key • PTT status LED indicator certificate and approved safety compliance EN 60065 standard anti-interference compliance EN 55103‑2 standard radiation compliance EN 55103-1 standard area certification European CE