Larzio is a communication App and works like a walkie-talkie. Users can simply push-to-talk(PTT) to communicate with each others. Each time you talk, the voice will be recorded in your phone. Larzio can work with real walkie-talkies. Larzio users can PTT to communicate with a real walkie-talkie user. througn an RoIP(Radio over IP) Gateway.