This is a set of two panic alarm buttons and four panic alarm sounders. The panic buttons are supposed to be able to transmit up to 180 in the open. they show a red led when pressed and are water resistant. You can select a sound notification from 45 melodies (36 melodies and 9 alarm sounds) and they can be set the same or different on each unit. They can be set to sound only, sound and light or light only. Included :1) 2 panic alarm buttons2) 4 Alarm Sounders3) A new set of batteries for the sounders4) Paper Instructions
