1)with WiFi function, you can connect the phone to control the working status of the 3D printer at any time.
2)D4 equipped with the camera, you can monitor the printing status at anytime and anywhere via the mobile app.D2, D3 no this function.
3)3.5 inch colorful touch screen (screen of common machine is in black and white), multiple functions, easy operation, user-friendly interface 
4)Simplified installation steps, only four screws and racks, and standardized wire, even for new beginner can install the 3D printer quickly.
5)Our printing head support almost any existing filament including : PLA, ABS, PLA composites (Carbon fiber, Wood, Copper, Brass, Magnetic ), Hips, Nylon, TPE & TPU (FleX), PETG...
6) Heat bed can reach 110 degree quickly, to make it finish printing rapidly and able to print small models with ABS material
7)Safety LED light, you can check the printing status clearly 
8) Dual-Gears Extruding, High Gear Density,Feeding Rate Increasing, Powerful Extruding, Smooth Feeding
9) High Quality Direct extrusion, making good printing effect and smooth surface, which can print multi kinds of filaments, including flexible material, such as TPU etc
10) Industrial professional limit switch, can precisely position, and guarantee the printing quality of prototypes
11) Filament sensor, 3d printer machine will stop working if no 3D printer filament, and will work if reinsert new materials.
12) Strict testing process. Each machine is subjected to a strict maximum size testing and different shape print ing model testing, which will be tested over 10days to guarantee the machine quality before packing