- Hollyland Solidcom M1-4B - Wireless Intercom System, consisting of 1x base station, 4x beltpack, 4x LEMO single-ear headset, 1x charging station, full-duplex (FDX), grouping of beltpacks in up to three groups possible, simultaneous group calls for up to 16 persons in three groups with two cascaded sets possible, transmission frequency: 1.9 GHz, bandwidth: 1.728 MHz, transmission power: max. 21 dBm, range: 450 metres, headset circumaural, frequency response: 200 Hz - 7 kHz, signal-to-noise ratio: > 50 dB, distortion:
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