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Product Title: ELEGOO Mars 4 Ultra 9K MSLA 3D Printer with WiFi ConnectionMain Features:. 7-inch 9K mono LCD with 8520x4320 resolution and 18µm XY resolution. Powerful Linux operating system with 4G RAM for faster and smoother operation. Built-in WiFi connectivity for effortless file transfer. 4-point hassle-free leveling system for perfect prints every time. User-friendly 4-inch HD IPS touch screen with support for 12 languages. Plug-in air purifier for a purified printing environment. 9K Accuracy with Stunning Detail:The ELEGOO Mars 4 Ultra offers exceptional printing quality and details. It features a 7-inch 9K Mono LCD with 8520x4320 resolution and 18µm XY precision, allowing you to produce highly detailed models with incredible accuracy.High-Speed WiFi Transfer:The brand new Linux OS with built-in 4G RAM supports WiFi transfer with a speed of 6-10Mbps. It is compatible with both 2.4G and 5G networks, making file transfer easy from your computer or mobile device. The detachable WiFi antenna is conveniently placed on the side of the printer for easy connection.COB Light Source Fresnel Collimating Lens:Experience vertical and uniform exposure with the 405nm wavelength beam thanks to the COB light source and Fresnel collimating lens. This provides consistent curing across the entire build area with less than a 5-degree light angle and 92% light uniformity, resulting in smooth and even surface finishes on your models.Stable Printing Performance:The Z-axis adopts a linear guide rail structure with an accuracy of 0.02mm, ensuring precise and stable movement for smooth and delicate surfaces on your models. The 4-point leveling system eliminates the need for repeated leveling, saving time and effort. The laser-carved surface on the build plate enhances adhesion, even when printing large models.