The model is wireless ISO base station with secure communication. Digital Frequency Hopping Spread Spectrum with encrypted signals secures communication so people outside the system can't hear your conversations. Provides the strongest signal possible for clear, seamless and uninterrupted conversations. he BS200 Base Station operates on either the supplied AC Adapter or an external DC source such as a vehicle electrical system for rack mounting in an ENG van. Expandable system enables up to eight base stations to be used together for a total of 120 COMMUNICATORs with up to 32 in hands-free, full-duplex mode. Wireless ISO allows all mobile users on the same base station to converse with each other isolated from the two- or four-wire intercom channel which can be restricted to specific users.