Speco Technologies' UL listed Contractor Series amplifiers are designed for long-running, every day use. They can stand on their own to run a smaller installation, or be incorporated into a much larger job. With RMS power ranging from 30W to 120W, microphone and source-mixing ability, telephone paging interface and music-on-hold capability, there's practically no job where one of these amplifiers wouldn't be a perfect fit!Speco Technologies' UL listed Contractor Series amplifiers are designed for long-running, every day use. They can stand on their own to run a smaller installation, or be incorporated into a much larger job. With RMS power ranging from 30W to 120W, microphone and source-mixing ability, telephone paging interface and music-on-hold capability, there's practically no job where one of these amplifiers wouldn't be a perfect fit!