... +3dB~-3dBSpurious Radiation≤7.5uWOccupied Bandwidth≤16KHz(1) GSM Mobile phone:Network Frequency: 850/900/1800/1900MHzSIM: Dual SIMScreen: 2.2 ... 128Mb+PSRAM 32Mb , support 2GB TF card to expand memoryMobile Internet: WAPMessaging: SMS / MMSMultimedia: FM Radio, Camera, Image viewer, Video player ... temperature: 25oC ± 5oCStandard audio signal: 1KHz PX-D03 Dual Band Cell Phone Radio