It is an intercom app (transceiver app). You can have a conversation between iPhone connected to WiFi. Features ・ One-to-many call ・ Display of the other party's name ・ Bluetooth headset support ・ Automatic call can be started by detecting voice ・ Voice level adjustment ・ Supports call start sound This app is a feature-cut Lite version of MyIntercomPro. For business use, I recommend MyIntercomPro.