DECT7: Up to 1,600 feet of line of sight range. Hands-Free, full-duplex intercom plus listen-only radio in intercom mode. Configure up to five channels. Up to 100 listen-only connections per base station. 110/220VAC Power supply & 12V DC Automotive charging cable included. Windows PC Programmable for feature customization and upgradability. Compatible with all generations of Sonetics DECT Wireless headsets. Not all Features available with first generation and second generation wireless headset and belt packs. Accessory remote antenna (Sold separately) For extended range.