I made this because I thought I needed it, but I only used it to check the sound. It's a passive, switchless design, and is extremely small and lightweight. 1 in 2 out or 2 in 1 out can be used. Recommended for use when connecting to two amplifiers, etc. All jacks are new Switchcraft #11. The wiring used for the signal lines is of an unknown manufacturer, but I used some leftover wiring intended for use inside a guitar. I didn't experience any noise during home testing, but since it's a plastic case, noise may occur depending on the usage environment. Applying aluminum tape might improve it, but I'm selling it as is. The fourth image is a size comparison. Batteries are not included. Height: 75mm Width (including jacks): 57mm Height (including rubber feet): 29mm