Cooper Crouse‑Hinds Flex‑Tone Series are explosion proof, heavy duty, and selectable signaling devices capable of producing volume‑controlled high decibel tones. They are designed for remote mounting in Division 1 areas, and accept up to two contact closures while delivering two audible output signals. Available in both AC and DC voltages, the Flex‑Tone can be mixed and matched throughout an application using the available line power.