*The one-touch LED series 2 is a specially designed LED lighting system for model embedding.You can add functions such as power supply, switch, branch, and program blinking by consolidating the necessary functions on a small thumb-sized board and connecting the necessary boards.Since it is based on USB power supply, it is suitable for long-term use in exhibitions and diorama applications.*Extension harness 20cm (2 pieces) WH20This harness is twice as long as the harness (WH10) that comes with EXB4 and SW1. It is used when you want to extend the mounting location.