This link features the RD series power supply WiFi board, allowing you to conveniently control your RD device via a phone app. Note: Due to different factory batches, the inkjet coding is random and cannot be specified, which does not affect usage. SOFTWARE ISSUES: 1. Q: The APP crashes on my phone, what's the problem? A: For the APP and PC software, as there may be incompatibility issues, please download and try it first before purchasing. If you can download and install, you can place an order; otherwise, please refrain from buying. If you do not test the PC software and APP function before purchasing and find that the products work well except for the PC software or APP, we refuse to refund. For PC software, it only supports Win 7 and later for the time being. For the APP, it only supports Android 8.0 and later. 2. Why can't I connect RD60XXW to my phone APP via WIFI? A: Please check if the WIFI card is correctly inserted, then check if the WIFI is 2.4 GHz and if you turn off client isolation/AP isolation and WMM function, and check if you enable the location service and storage service when installing the APP. 3. Why can't I connect RD60XX-W to PC via WIFI while I can connect to the phone? A: PC WiFi connection is a test function. Due to poor compatibility with some computers, if you cannot connect PC software via WiFi, please ignore this function. We do not provide support for this function. Color: Green Material: ABS Package Contents: 1 * DC regulated power supply wifi module