Technical specifications CPU master: Qualcomm Snapdragon 8909 Cortex-A7 CPU frequency: Quad-core 1.5GHZ Built-in memory RAM: 1GB NANDFlash: 8GB Display: 4 inches Screen display: IPS HD capacitive touch display Resolution: 800×480 Operating system: Android5.1 Development environment Development language: Java Development tools: Eclipse/Android Studio Use environment Working temperature: -10℃~+50℃ Storage temperature: -30℃~+60℃ Environmental humidity: 5%RH~90%RH Hardware function WIFI: IEEE802.11b/g/n Support frequency band: …