-H PCB Upgrade Features added after the update: Lower power supply noise, less noise when using harmonics; Built-in 400mAh battery Add a Micro-SD card to save the ; Add support; Modify the port names to Port1 and Port2 Colour: black Material: metal Package Contents: 2 x host (with 2.8-inch touch screen, 400mAh battery) 4 x 20cm SMA male to male RG174 cable 2 x SMA female to female connector 2 x SMA Simple Calibration Kit SHORT 2 x SMA Simple Calibration Kit OPEN 2 x SMA Simple Calibration Kit LOAD 2 x USB Type-C data cable 2 x Touch pen 2 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.