Thank you for your valuable feedback, which will help us improve our progress. You have customized a 3 * 4 meter lightbox, and we have informed you before placing the order that the lightbox back panel needs to be purchased locally (sent from China, which will result in a large packaging size and very expensive transportation costs). Inside the packaging, we have a power supply, 12V LED light strips, and 20 light strips in a group. They are distributed and wired according to the lighting diagram. We also have backup quantities of light strips that need to be assembled on site. Thank you again for your support. We wish you a happy work and the best wishes. We will actively consider your valuable opinions and provide better and more thoughtful services to our customers until we help them succeed