Pro Intercom BP.15 Miniature Single Circuit Belt PackContinuing Our Tradition Of Superior Performance In A Smaller Package Our BP 1 has a long reputation for ruggedness and reliability. The BP. 15 incorporates the very same characteristics that earned the BP 1 those accolades. The cabinet is a strong, aluminum extrusion with internal ribbing which not only adds to its strength but provides for support of the printed circuit board along the full length of both sides. The durable end bezels deflect