Bosch FMM-100WPBB-R Bosch FMM-100WPBB-R alarm / detector accessory

A red cast‑metal weatherproof back box measuring 4.75 in. x 3.25 in. x 2.25 in. (12 cm x 8.3 cm x 5.7 cm) with ½ inch (12.7 mm) knockouts in the sh...