iTalkie is a bluetooth speaker-microphone designed for PTT applications.
Features:
HD voice
Qualcomm® cVc™ audio technology
Battery life: est. min. three consecutive work shifts
Support Zello App on Android (iOS not supported)
Buy it at amazon https://www.amazon.com/Bluetooth-Microphone-Button-speaker-Android/dp/B01NBB7DU0
The video tutorial is available at https://youtu.be/oi3AjYY8npA