The Hollyland Solidcom M1 Beltpack (HL-M1BP01) is an additional or replacement wireless beltpack for the Solidcom M1 full-duplex 1.9 GHz DECT intercom system, which is used for church services, electronic field production, exhibitions, concerts and other events where crews need reliable hands-free talk. It links to the Solidcom M1 base station, supports up to three talk groups configured from the base station, app or web page, and gives up to 400 m (1,300 ft) line-of-sight range from the base's built-in panel antenna. The beltpack has a 3.5 mm headset input, a LEMO headset connector for professional headsets and a USB-C port, and it runs on a removable 1,500 mAh lithium polymer battery. Audio response is 200 Hz to 7 kHz with a signal-to-noise ratio above 50 dB and distortion below 1%, and a sidetone function lets the user hear their own voice. It measures 105 x 65 x 22.4 mm and weighs about 200 g. The Solidcom M1 base station and headset are not included and are required.