The V-5330100 is a voice coil (45 Ohm) 3.4 volt model with volume control.P-TEC speakers consist of a 3.6 inch cone speaker mounted in a unique surface-mount baf-fle. The baffle is designed for mounting on acoustic tile, such as those normally found in sus- pended-ceilings; and can be mounted without cutting large holes in the tile. The mounting pins can be removed for mounting in a hard ceiling. The speaker housing has screw holes for securing speaker without mounting pins. Although the P-TEC speakers are designed especially for stan- dard suspended ceilings, they can be used on many types of ceiling materials.