No technical service will be probided after the product is sold, thanks for understanding.Please allow 1-5mm errors due to manual measurementItem color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated sameHave: 1×breakout board 1×USB cable 1×CD (If you have not received the CD, the qr code provided below is the content of the CD. You can extract the content yourself.)