A few useful gadgets (this week's pick)

The following recommends several gadgets found this week. We call them gadgets because they need not too much introduction, and you can understand them at a glance. But don't underestimate them because of their small size. Sometimes, they are quite useful, and most of them are interesting!

We won't write a separate blog post for these gadgets. In the future, we will regularly recommend them to you in the form of "Recommendation of the Week". Please keep an eye on it!