We used a 4 inch LCD screen. We have now increased the measurement frequency of to 1.5G. Due to the larger screen we now have more PCB space for components and batteries, so now we use a separate charge pump to power the mixer and added capacitors to further reduce power supply noise. 1950mAh battery It can be used independently for more than 8 hours. Added DC dimming to the 4.0-inch full-view LCD screen, which can be seen more clearly when used outdoors and more comfortable when used indoors. In order to facilitate geeks to create more possibilities, UART1, PC14, and PC15 are introduced on the PCB. Thanks to the manufacturing experience of -H, a new ABS shell for -H 4, which can effectively protect SMA connectors and buttons. Every set of -H 4 is installed with a complete shell note: Different batches may cause differences in product appearance, printed text, and color, which not affect the use Material: plastic colour: black Package Contents: 1 x -H4 host(including 4-inch touch screen, built-in battery) 2 x 15cm SMA male to male RG316 cable 1 x SMA female to female connector 1 x SMA Simple Calibration Set SHORT 1 x SMA Simple Calibration Set OPEN 1 x SMA simple calibration set LOAD 1 x USB Type-C data cable 1 x Type-c to Type-c cable supports connection with most Android phones 1 x Pick 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.