The BOSS AB-2 is a guitar effects pedal that allows you to select between two outputs from a single input. - Model: AB-2 - Type: 2-WAY SELECTOR - Input/Output Terminals: 1 IN / 2 OUT - Color: Blue The BOSS FS-5U is a guitar switch with variable polarity settings. - Model Name: FS-5U - Brand: BOSS - Connection Terminals: 1/4 inch jack - Polarity Setting: Variable - Color: Silver/Black Both units show signs of use, such as scratches, dirt, and minor blemishes. Please check the condition in the photos.