Cooper Notification’s Wheelock Series EH speakers and speaker strobes produce high fidelity sound output in a low-profile design for indoor wall- and ceiling-mounted applications, where intelligible voice is required. They have a wide frequency response range, (300 to 8,000 Hz) and dual-voltage (25/70 VRMS) capability, and field-selectable taps from 1/8 to 2 watts. The design incorporates a speaker-mounting plate, and each model has a built-in level adjustment feature with either a snap-on cover with no visible mounting screws or an aesthetic two-screw grille cover.