The ToooAir TA-682 Handheld PTToC Push-to-Talk over Cellular Walkie Talkie is a robust sturdy handheld that is both 3G / 4G and 4GX the unit is packed with new features and is still as compact as the TA-388. TA-682 comes equipped with a list of new features including: new user-friendly GUI, additional programmable keys, M5 pin connecter, adjustable sound quality, voice recordings and group monitoring. Extremely robust and empowered with the latest digital PTToC Push-to-Talk over Cellular technology offering VoIP two-way communication. The unit is ready for work