Features: brand new and high quality Added web interface that allows much better control of printer Allows easily backup and restore firmware. Easy and convenient to edit the firmware configuration directly in the web interface, eliminating the need of constantly flashing the board when you do major changes Use the Duet Firmware for SKR boards and can use more silent drives like the TMC2208 and TMC2209 You can install the Duet Firmware for SKR boards and run the RepRap Firmware on SKR v 1.3/ SKR v1.4 Specifications: Product Name: BTT RRF WIFI V1.0 Module for:3D Printer Motherboard Expansion Module Size: approx 8.43X4.6cm/3.32x1.81in Package Includes: 1 PC x BTT RRF WIFI V1.0 Module note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.