DSS modules, and operator phone headsets. It also provides convergence and integration products such as GSM terminals, wireless (DECT) systems, IVR auto-attendants, phone traffic control systems, VoIP and network products, call recording systems, converters, door phones, lightning protectors, caller ID base units, and battery backup interface products.

Karel offers its communication solutions for hotels and touristic facilities, public institutions, medical institutions and hospitals, universities and educational institutions, factories and production facilities, merchandising and retail business, and banks and finance institutions. In addition, it offers visual communication and security systems, such as CCTV cameras, DVRs, lenses, and accessories, as well as CCTV support applications comprising mobile and web applications; and intruder alarm systems, such as wired and wireless alarm system products, integrated systems, peripherals, and accessories, as well as undertakes security projects for residences and housing estates, plazas and office centers, shopping malls, touristic facilities and hotels, industrial manufacturing facilities, airports, prison and detention houses, and hospital and medical facilities.

Further, the company provides cloud solutions with Internet applications that facilitate the business processes, and provide economy and productivity for corporate users; and electronics manufacturing services as well as undertakes telecommunication and defense industry projects.

The company was founded in 1986 and is headquartered in Istanbul, Turkey.