Kydera LTE-880G 6000mAh 4G ptt android sim card walkie talkie 500 miles telephone portable android Main Features: 1. Support WCDMA/GSM/4G/Wifi. 2. Bluetooth is acceptable. 3. Support GPS. 4. The system is developed based on Android 5.1. 5. High battery capacity, about 6000mAh. 6. Unlimited talk range 7. Walkie talkie can be used without SIM card only connected Wifi. 8. Support group call/private call. 9. Support record vocie communication automatically. 10. The battery strength alert 11. The system can be installed in Android phone, using that phone to call. 12.APK customzied  13.Support Cloud platform  14.Type C charging  Technical Specification: Dimensions 111*58*38mm Weight 195g Operating environment -25~75℃ Working requirements 3.7~4.2V RX Sensitivity -107dbm Battery power 4400mAh Charging requirement 5V