The OTTO Connect Wireless 210 1-Channel Intercom with 8 Talk Slots is a conversational system that enables hands-free communication among teams of people. It provides up to 18 hours of talk time with up to 8 speaking users and unlimited listeners in a group. The first 8 units powered on are speaking units. The digital signal processing technology provides ambient noise reduction in high-noise environments. The intercom operates in the 900 MHz frequency range, through walls, in rain, and over larger distances.