When you see a product labeled "USB Drive CH341 3.1", it is almost always one of two things:
Basic versions are often "bare boards," but newer "all-in-one" versions (like the DSD TECH SH-U05A) come with protective casings for safer use. Common Use Cases usb drive ch341 3 1
The CH341 is slow (writing a 16MB BIOS takes ~5-7 minutes), but for $5, the latency is acceptable. When you see a product labeled "USB Drive CH341 3