The Accu-Lites Multi-Zone BDL168 Breakout Board is a multiple-input breakout board for the BDL168 block detector. It eliminates soldering connections to the card edge or card edge adapter of this product. This design has four separate inputs, each tied to a specific detection zone. Each zone has four individual detection sections. Check out the entire line of Accu-Lites Tortoise Switch Machine and other electrical accessories.