Ideal for BOSS effectors' external footswitch "CTL": Unlatch Switch Normally Closed, Unlatch, Momentary Type N.C.: Normally Closed This product is specifically designed for BOSS effectors, such as multi-effects (GT/GX) or compacts like delays and loopers, where the external footswitch [CTL] is often Normally Closed. It's made exclusively for Normally Closed use, eliminating the need for a polarity switch. Although it's a momentary type, the footswitch has a firm, clicky feel rather than a mushy one, making accidental double-taps less likely. Smaller than the BOSS FS-5U, it's easy to fit on your effect pedalboard! Simple, rugged, and timeless unpainted aluminum silver finish! *Please note that as this is an unpainted aluminum silver finish, minor scratches and blemishes are inherent to the material, even on new items. Connection Terminal: Standard Jack External Dimensions: 50W x 50D x 29Hmm (excluding jack and footswitch) Height including footswitch is approximately 45-48mm. Please attach Velcro tape or rubber feet to the back as needed. ***Please refer to the 3rd image for usage with a BOSS FS-5U, comparing it with the instruction manual. This is NOT for BOSS FS-5L or for unlatch/normally open specifications, so please be careful not to make a mistake. Immediate purchase is welcome. Shipping only on weekdays (no shipping on Saturdays, Sundays, or holidays). -------------------------- BOSS GT-1000 GX-100 GX-10 RE-2 GT-1 IR-2 DD-3T SL-2 DD-8 RC-5 SDE-3 SY-1 MS-3 RC-600 RC-1 RC-3 MD-500 VG-800 DD-200 OD-200 MD-200 SY-200 RV-200 EQ-200 IR-200 DD-500 RC-10R - Type: Footswitch - Function: Normally Closed - Use: For BOSS Effectors - Model Name: Unlatch Thank you for looking.