Display resolution 320 x 240 pixels; Screen diagonal 2.8 inch 16 bits per RGB pixels; Resistive touch control Jog switch control; USB serial port control Optional TTL USART port (SW not yet implemented) on the internal PCB Linear power supply to avoid switching noise. Add port ESD protection to upgrade version(V0.3.1_E) Material: ABS+metal colour: black Package Contents: 3 x Host (with 3000mAh battery, 4 inch display) 3 x USB Type-C data cable 6 x 30cm ALSR100 SMA cables 3 x SMA-SMA connector 3 x Antenna with SMA connector 3 x Lanyard and touch plectrum 3 x 32GB MicroSD card(plugged in the host) 3 x touch pen 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.