Located at Essex, Md. Chesapeake AED Services is one of the largest CPR training companies. It is an American Heart Association and ASHI training center. It caters to a number of clients, including the U.S. State Dept., the Department of Homeland Security and DLA Piper. It offers group and individual training facility as well as offers online training. Chesapeake AED Services offers a range of products, including programs, sales of accessories, batteries and electrodes, cabinets, emergency oxygen, site assessments, program management and leasing facility.