Hello, ①That's a jumper cap. it is used to short circuit always-on power option : 【AL ON: Short: Power always on, power button disabled】; ②If you want to use always-on power function, you need to prepare the solder pins yourself and solder it in the 【AL ON 】position and then use the jumper cap to short-【AL ON】 to enable always-on power function. please refer to X306#Updated info