2-Channel Portable Headset Main Station with built-in 1-amp power supply - CE approved, UL Listed The CS-702 is a portable main station with a power supply and a versatile intercom monitoring system. It supports up to 40 beltpacks or 10 speaker stations on 2 channels. CS-702 accepts mic or line-level audio program input, assignable to either or both channels, with interrupt switch to override program.