CASE1: Provide circuit boards and plugs, and the buyer will solder them according to their needs.

CASE 2: Provide circuit boards and plugs, and the seller will solder and deliver them.

If powered via USB, the cable should not be excessively long, nor should the wire gauge be too small, so as to ensure a stable supply voltage.

Please leave me a message.

When shipping, I will provide photos, including the appearance of the project and the project nameplate labels

As for the tail circuit board, it was developed by ourselves.

This is a pre-owned item, so I can't make extensive guarantees. If you need more details beyond the information shown in the product photos, you may contact me to arrange a functional test, provided I have the available conditions to do so. Once the item is shipped, return requests citing seller-related issues will NOT be accepted, unless the item is damaged/lost during transit, or the received item is inconsistent