Features: OOTDTY This wifi module is and developed by Makerbase team,which is capable of high transmission rate and stability And, it is compatible greatly with Robin mainboard. It not only supports document transfer APP- ,but also supports Cloud printing- and firmware upgrading. The Robin WIFI module based-on ESP8266 chip developed by D-personnel of the maker-base. Small size, fast- transmission speed realize cloud service printing Specifications: Name: Robin-WIFI Module Size:approx 25x23mm/0.98x0.91in Connection module: Robin Touch-Screen User configuration: cloud server- Androids iOSApp Upgrade- firmware: SD-card WEB Package Type: Robin-WIFI Module / LCD Screen Package Includes: 1PC Robin-WIFI Module/ LCD Screen (Optional) Note: Due to the problems of lighting effects and angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.