Radio-Tone RT4 Smart Phone + RT-CRC1  Controller Radio Over POC Radio

It also can use on most walkie talkie apps
( zello Real PTT Team speak Echolink ) 
 

The RT4 + Controller is a state-of-the-art radio over IP network  controller. It is employed advanced digital voice processing technology to  interface with most popular voice messengers for bridging 2 or more radio  networks. It is an easy of operation, cost effective and highly flexible  platform for extending communication range by linking conventional two-way radio  into a radio over zello system.
 

Model NModel No.   Radio Tone RT4 Features High Sensitive GPS antenna Support PTT Support GPS/BDS Dimensions 130*56.5*34mm Net Weight 260g (include battery) Band GSM: 850/900/1800/1900 (B2/3/5/8) WCDMA: 850/900/1900/2100(B1/2/5/8) TDD-LTE:2600/1900/2300/2600 (B38/39/40/41) Sim Card Dual SIM card dual standby (one is micro SIM) Service Provide Unlocked Shell Material Plastic OS Android 6.0 Applicable to other Walkie Talkie App CPU MTK6737, Quad Core 1.3GHz 　 RAM 1GRAM ROM 8GB ROM, support TF card up to 32GB Screen 2.4 inch QVGA capacitive touch screen, 320*240 Data transfer USB/Bluetooth Mobile internet WAP/WiFi Camera Double cameras, 2.0MP front camera, 5.0MP back camera Message SMS/MMS Input Handwrite/Keypad GPS Yes, also support A-GPS/BDS WiFi IEEE 802.11 b/g/n Working time Up to 20 hours Running on Zello App Standby time Up to 96 hours 　 Other Features Email, Wallpapers, Calendar, Calculator, Clock, Play Store, Tethering & portable hotspot, etc Languages English, Bahasa Indonesia, Bahasa Melayu, Cestina, Dansk, Deutsch, Espanol, Filipino, French, Hrvatski, Italiano, Latviesu, Lietuviu, Magyar, Nederlands, Norsk, Polish, Portuguese, Romana, Slovencina, Suomi, Svenska, Vietnamese, Turkish, Greek, Bulgarian, Russian, Ukrainian, Hebrew, Arabic, Thai, Cambodian, Korean, Simplified/Traditional Chinese Color Black Dual SIM card dual standby

Radio Tone RT3  Smart Phone