When requiring long-range communication, the PRO-PIB20 Multi-Handset Bundle with External Antennas from is the ideal solution. This comprehensive bundle includes the PRO Handset base, four PRO Handsets, eight battery packs, four charging cradles, and more. With the external high-gain antenna provided, these phones offer coverage across 250,000 square feet and through multiple floors of a building. The setup is easily integrated into various phone systems such as PBX, VoIP, PSTN, FXS, or POTS. Expandable to support up to 90 handsets by incorporating additional base stations, this system extends signal reach through 12 floors within 250,000 square feet or over 3,000 acres of open land. It allows for direct announcements to all handsets or specific groups, facilitating emergency and company-wide communication.