Complete ASL intercom system for 2 people, comprising 1 x BS181 power supply, 2 x BS15 beltpacks, 2 x HS-1/D single ear headphones. Just add microphone leads to connect beltpacks and power supply. The Basic Series provides a cost-effective solution in more limited applications that require full duplex, party line communication. All interconnections are made with standard, balanced microphone cable with XLR-3 connectors. Installation requires no expert knowledge, and clear layout of controls assures trouble-free operation with a very short learning curve. A current-driven interconnect loop ensures that operator listening levels do not change as stations are added to or removed from the network.