Attentions 1. All products (except those specially marked) are loose parts, and the buyers need to solder, assemble and debug by themselves. If you need finished products, you can contact customer service to buy them. 2. Due to shipping restrictions, the product does not include any batteries. 3. If there is a problem with the product you received, or there is a problem during the soldering and assembly process, please contact us as soon as possible. 4. If you need the shipping of the package to be checked and faster, please choose the “AliExpress Save Shipping” or “AliExpress Standard Shipping” shipping method. 5. If you are satisfied with the product, you can leave us a 5-star review. We will appreciate it. Thank you for your support!!!