Clear-Com – DX121 System w/ WH200 Headset on May 8, 2017 | Marketing Team The HME DX121 system is comprised of the BS121 base station, BP200 beltpack or WH200 wireless headset, and compatible headsets. The DX121 supports 1 full-duplex or 4 push-to-transmit shared beltpacks, while providing interface option to 4-wire intercom systems only. It is a highly portable and versatile system that can be plugged directly into the headset jack of any intercom station or into a four-wire connection of a device such as a digital matrix intercom. The 2.4 GHz frequency-hopping, Spectrum Friendly technology allows up to eight DX121's to be used together to support multiple channel applications. The DX121 can be used to support wireless channels for theatrical and live crew events, broadcast control room operators, technical support crews and for connecting remote staff at large venues.