The Hollyland Solidcom M1-4BP is a full-duplex wireless intercom system for small production teams, supplied as a package with a base station and four wireless beltpacks with professional single-ear LEMO headsets. It is aimed at events of roughly 100 to 1,000 guests such as concerts, church services, exhibitions, corporate shows and electronic field production, letting camera operators, stage managers and crew talk hands-free. The system runs in the 1.9 GHz band (GFSK, 1.728 MHz bandwidth) with a line-of-sight range of up to 400 m (1,300 ft), a 200 Hz - 7 kHz audio response with noise cancellation, up to three talk groups, sidetone, and setup via app or web page. The base station offers PoE and power inputs, 2-wire and 4-wire audio interfaces and USB, and can be cascaded with other units. Each 200 g beltpack has an LCD screen and two removable Li-ion batteries that charge in 2.5 hours and run about 6 hours each. The package includes the base station, 4 beltpacks, a charging base, 2 high-gain omni antennas, 4 LEMO headsets, 8 batteries, a PoE adapter, a 5 m RJ45-to-XLR cable, USB-A to USB-C cable, 4-pin XLR adapter, user manual and warranty card.