Features:

1. 4inch IPS screen, 480×800 hardware resolution.
2. Resistive touch control.
3. Compatible and Direct-connect with any revision of Raspberry Pi (except the Pi 1 Model B or Pi Zero, which requires an HDMI cable).
4. Drivers provided (works with your own Raspbian/Ubuntu/Kali/Retropie).
5. Also works as a computer monitor, in this case, the touch panel is unavailable and an HDMI cable is required.
6. HDMI interface for displaying, no I/Os required (however, the touch panel still needs I/Os).
7. 3.5mm audio jack, supports HDMI audio output.
8. The backlight can be turned off to lower power consumption.

Features:

1. Extremely cost-effective
2. Good high-speed performance
3. Automatic idle-current reduction
4. 3-state current control technology
5. Self-adjustment technology
6. Pure-sinusoidal current control technology
7. TTL compatible and optically isolated input
8. 15 selectable resolutions in decimal and binary, up to 25,600 steps/rev
9. Suitable for 2-phase and 4-phase motors
10. DIP switch current setting with 8 different values
11. Support PUL/DIR and CW/CCW modes
12. Short-voltage, over-voltage, over-current protection

1. Step Angle Step Angle: 1.8 °
2. Current: 4 A/Phase
3. Holding Torque: 306 N-cm
4. Detent torque: 6.8 N.cm (Maximum)
5. Lead Wires: 4
6. Shaft diameter: 6.35 mm