The Commax DP-2S + DR-201D Audio Intercom Kit is a dependable 1-to-1 wired audio door phone system designed for homes, offices, apartments, and small businesses. The kit includes the DP-2S indoor handset and DR-201D outdoor door station, providing clear two-way voice communication and remote door unlocking when connected to an electric lock. Its 2-wire non-polarity installation ensures quick setup and reliable daily operation.