The buffer IN is located on the top of the enclosure. The LED lights up blue when the power is turned on. There is no problem with either the IN or OUT for the Through IN/OUT. You can freely arrange them to suit your effects board. 【Specifications】 ・Case: 39 x 92 x 31mm ・Power: Center negative 9V ・PtoP wiring using a universal board ・Junction box: 2 Loops 【Customer Reviews】 "I think it's great that you can build something like this. It works well. ^_^" "I'm a repeat customer because it does a great job." "The sound quality has improved and is wonderful." "It's confirmed to be on my main board. Thank you." "The sound became surprisingly good!! The sound image became clear, and it transformed into a sound with sharpness and sex appeal! It's truly wonderful! Thank you very much!!" This compact junction box houses the buffer section of the Klon Centaur, which is reputed to make the sound better and thicker just by passing through it. It allows you to consolidate the inputs and outputs of your board in one place, helping to prevent jack damage from plugging and unplugging. Since the buffer circuit is passed through immediately after the input, you can make it compact without preparing a separate buffer. It is intended for continuous use, so there is no ON/OFF switch. As expected of a legendary device. You can see why professionals all use the Klon Centaur's buffer. I tried it before my Vemuram Jan Ray, and the sound became thicker, the cutting became crisper, and the dynamics of the clean sound, with a moderate amount of distortion, increased even more, making it very pleasant to play. Overall, it gives the impression that the sound becomes more vibrant and energetic. You will likely feel the effect more as you play louder or increase the number of effects. A buffer is not a device that provides a dramatic change like a distortion effect, but it is recommended for those who use multiple effects pedals, those who are concerned about sound degradation or noise, those who use long cables, and those who want to improve the performance of their effects. It is basically intended to be connected directly after the guitar and used constantly ON. ※This is a device where the effect is difficult to understand audibly, so we recommend purchase only for those who have knowledge of buffers.