Cooper Wheelock

Some of the earliest signals produced by Wheelock were the A-1 series of AC-powered, dual-projector electromechanical horns. In the early 1970s, Wheelock introduced the 31 (AC-powered) and 34 (DC-powered) series of electromechanical horns. Around 1976, Wheelock created the 7001 (2-wire, flush-mount DC), 7002 (2-wire, surface-mount DC), 34+WS (4-wire, surface-mount DC), and 7004 (2-wire, surface-mount AC) electromechanical horn/strobes. These were the first fire alarm signals to use xenon strobes instead of incandescent lights. The signals either had pigtail leads or screw terminals for power. Models with screw terminals had the letter "T" in their model numbers (e.g. 34T, 7002T). The horn and strobe on the 7001 and 7002 models are wired in series, causing the horn to produce a distinctive "skipping" sound when the strobe flashes, similar to the "March Time" code. In late 1984, Wheelock redesigned the horn's grilles, making them vandal resistant; and shortly thereafter, pigtail leads were discontinued. This product line became extremely popular among third-party security companies, such as Honeywell, Ademco, and Cerberus Pyrotronics (now part of Siemens AG). In 1994, Wheelock discontinued this series, because their low-intensity strobes did not meet the new light distribution requirements of the ADA. The replacement was the MT series. The 31T is still in production today for general signaling purposes.

In March, 2006, Wheelock, Inc was acquired by Cooper Industries.

Cooper Wheelock also produces several bells as well as speakers, synchronization modules, booster power supplies, chimes and voice evacuation products. Cooper Wheelock does not manufacture fire alarm control panels (except for the Safepath Voice Evacuation System), smoke detectors, or heat detectors. However, many fire alarm control panels are compatible with Cooper Wheelock's line of notification appliances and other products. Wheelock also produces notification devices for Siemens Building Technologies for its fire alarm systems such as the Cerberus Pro Modular. These notification devices manufactured for Siemens are the same device, but with major differences in synchronization. A few examples of some products Wheelock makes for Siemens include the Z-Series (ZH and ZR series), E series (SE, SEF, SEFH, SEH and SET series), the LED3 and Eluxa series (SL and SL2 series), and more, with the exception of Exceder Xenon devices.

Series ET

The ET Series was a series of speakers / speaker strobes released around 1983, and utilized the 7000 series style strobes, model (ET1010-WS) had a strobe and (ET1010) was a speaker only

Series MT

The Series MT (Multi-tone) was introduced in 1993. It features eight different tones including Continuous Horn, Code-3 Horn, March Time Horn, Code-3 Tone, Siren, Slow Whoop, Hi-Lo, and Bell. These could be set using DIP switches on the back of the horn. However, most of the tones did not grab the attention of bystanders. The most commonly used tones were Continuous Horn, Code-3 Horn, and March Time Horn. The MT has seen different strobe types over time, including translucent vertical strobes, transparent vertical strobes, and transparent horizontal strobes. The horizontal strobe design was introduced in 2002, and is still used to this day.

Series AS

In 1995, Wheelock introduced the AS, a combination horn and strobe. The AS was first created with a vertical position strobe on the right side of the horn, except for 110 candela models, which used a horizontal strobe. In 1997 when the NS was introduced, the strobe on all AS models was moved to the horizontal position. Additionally, Code 3 horn was added to the AS in 1998. In March 2010, the AS was discontinued, with its weatherproof variant, the ASWP, being discontinued and replaced by the Eluxa in late 2024.

Series NS

In 1997, Wheelock released the NS series. The NS is similar to the AS, except the design is much less boxy, and the piezoelectric speaker disc is slightly visible through the grill which also has an updated horn. It uses a strobe similar to the RSS line. This series has been discontinued since March 2010, and has been replaced by the Exceder series.