Hi : ) Thanks for reaching out. For the different versions-U1, due to our large orders, we will divide it into different suppliers. In order to distinguish different batches of products, we use different names to mark them. This is more convenient for our after-sales processing, the products are the same, and the manual may have some calibration. Actually, all of these version U1 has the same function. Thanks again : ) Have a good day Krystal