Daily iPhone App: Zello lets you chat walkie-talkie style with friends, co-workers | Engadget
Amazon.com: Talkimate Premium Wired Push to Talk (PTT) Speaker Microphone with Crystal Clear Sound Quality for Zello app on Both iOS and Android Devices. Box Included 1.2M Straight and 1.5M Spiral Audio
Zello app turns your phone into a walkie talkie and lets you make calls when phone reception is poor | The Sun
iPhone Zello Work Start Guide – Zello Help Center
Voice Chat App Voxer Gets New Competition From Zello, A (Non-Spammy) Push-To-Talk Alternative | TechCrunch
The best walkie-talkie apps for Android and iOS | Digital Trends
As Hurricane Irma Hits, People Turn to Zello App | PCMag
Zello Walkie Talkie on the App Store
Zello Apps on the App Store
Zello Walkie Talkie for iPhone & iPad - App Info & Stats | iOSnoops