SA-500 Rugged 100/200 watt electronic siren amp with dip switch options including the selection of desired siren tones. Reliable four position rotary switch features Wail, Yelp siren tones with push button override for Manual and Phaser or optional Two-Tone/HiLO sound and Air Horn. Pa has noise canceling mic. Hands free Horn Ring Cycler 2 No hassle 5 year limited warranty. Size 6 1/8"W x 2 1/8"H x 5 7/8"D