Zello

Zello is a fast, secure and reliable push-to-talk communication program. So you can reach more people, in more places, including those who are out of reach. Rather than relying on an unfriendly device with limited range, your team can use their own mobile devices to communicate, such as: iPhone, iPad, Android, BlackBerry and Windows Mobile.

Features:

- Manage users, channels and settings with a browser

- Advanced encryption ensures that all communications are secure

- Connection to existing LMR/PCM radio systems

- Free for 5 users, no time limit