Feature:1. PRACTICAL TO USE: for PortaPack firmware provides a user interface and the necessary signal processing to do many useful things without a computer.2. PORTABLE DESIGN: for PortaPack H2 makes software defined radio portable with three additional antennas and an SMA cable.3. MULTIFUNCTIONALITY: Adds user interface navigation controls, sound outputs and inputs, memory card slot, 0.5 PPM crystal oscillator, real time clock battery backup, speaker, lithium battery charger, and center button power on and off function (two clicks) ).4. ALUMINUM CASE, 3.2 INCH TOUCH LCD SCREEN: Premium aluminum case, can be well protected for portapack. 3.2 inch touch LCD screen.5. SOUND SIGNAL: You can easily listen to standard NFM and WFM sound signals by connecting the speaker to the transmitter's 3.5mm sound jack. Using for IOS or for Android headset MIC can send voice and headset can listen to sound with sound input and output function (ADC, DAC)6. CATCH WIRELESS SIGNALS, HIGH ACCURACY CLOCK: The transmitter can easily catch and replay wireless signals from ISM band remote controls. Comes with TCXO high accuracy clock (0.5ppm), the frequency is as accurate as the radio.Specification:Item Type: SDR Radio ReceiverMaterial: Aluminum AlloyColor: BlackBattery: Polymer Lithium Ion Battery (Built In) Capacity: 2100mAhFrequency Range: 1MHz-6GHzDisplay: 3.2 Inch Touch LCDMicro USB Port: For Charging and Firmware UpgradeMemory Card Slot: Up to 32GB (Without Memory Card) (For Recording RF and TX RF Download Maps of for AIS from for Portapack for Mayhem's Github)Bat Voltage: <=3.6V Auto ShutdownFirmware: for Mayhem 1.7.3 Firmware.Package List:1 x Receiver3 x Antenna1 x SMA Cable5 x Button 1 x USB Cable