The PortaPack makes the for One software-defined radio portable. It adds an LCD touchscreen, user interface navigation controls, audio output and input, micro-SD card slot, 0.5 PPM crystal oscillator, and real-time clock battery backup,Li po battery Charger and encoder power on/off function( one time to power on, twice to power off). The PortaPack firmware provides a user interface and necessary signal processing to do many useful things without a computer. designed aluminum case, can protect the portapack and for one well. Note:It need to use with for one, and your for one need to install the firmware first, or it can't work, please learn it before you buy, thanks. 3.2 inch touch screen With voice input and output function (ADC, ) With TF card slot (store data, playback data, frequency management) Built-in TCXO high- clock (0.5ppm), the frequency is as accurate as the walkie-talkie The firmware automatically switches the external TCXO (you can see the clock source is external in the menu) Support offline GPS simulation With speaker and cable soldered Colour:Black Material:PC+Metal Package Contents: 1 x Touch LCD Display 1 x Case with screws 1 x Speaker 1 x Battery Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.