RD series power supply wifi board in this link, make your RD device controlled by phone app conveniently. Note:Due to different factory batches, the inkjet coding is random and cannot be specified, which will not affect the use. SOFTWARE QUESTIONS: 1. Q: The APP crashes on my phone, what the problem is? A: For APP and PC software, because there may be incompatibilities problems, please download first before buying , if you can download and install, you can make order, or else stop buying. If you don't test the PC software and APP function before buying and find that the products works fine except the PC software or APP, we refuse to refund.For PC software, it only support win 7 and above for now. For APP, it only support android 8.0 and above. 2. Why cannot I connect the RD60XXW to my phone APP via WIFI? A: Please check if the WIFI board is inserted properly, then check if the WIFI is 2.4G Hz and if you shut down the client isolation/ AP isolation and WMM function, and check if you turn on the location service and storage service when you install the APP. 3. Why cannot I connect the 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 of some computers, if you cannot connect PC software via WiFi, please ignore this function. Forthis function, we do not provide for : download ruideng tech from the store for Android: app: https://drive..com/file/d/1H6EnkQJu5k-H3lKQxMcOk1Xs6ih2idYK/view?=sharing Decryption password: 1234 Colour:Green Material:ABS Package Contents: 1 * DC regulated power supply wifi module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.