The VSL base sounder beacon is for use with conventional fire alarm systems, including two-wire (SAV-WIRE?). It is designed to accept most leading detector bases and offers a cost-effective solution for sounder and beacon installation. The low profile combination is supplied with 32 tones, along with a two-stage alarm override which is activated by a third negative wire from the fire panel. The unique and highly visible beacon provides a neat and effective mounting solution in a single product.