Light duty indoor bells and buzzers, universally used in apartments, homes and OEM applications. Recessed bells, buzzers and combinations available. Bell sizes include 2 1/2", 3", 4" and 6". Low voltage service buzzers. More durable than standard residential buzzers for frequent use applications. Available in three sizes. Heavy duty vibrating bells for commercial and industrial applications. For indoor or outdoor use. Solid construction with one moving part. Available in gray or red, in 4", 6", 8" and 10" sizes.