Retevis RB21 4G Network Walkie Talkie, Long Range Network Two Way Radio, 2800mAh with Sim Card Slot 4G and Wi-Fi - Black, 1PcsVoice call and text call RB21 provides a powerful voice recording function, voice call function, and the function of using the keyboard to send text messages and other shortcut operations. GPS Positioning Equipped with high precision GPS and online positioning software, it can track real time location through different platforms such as PC and other smartphones. SOS Emergency Call SOS one key quick call for help, whether for work or daily use, in an