Not all such devices are manufactured equally, however. In fact, there are a broad array of choices and considerations for installers and their customers: holding force, finishes, local codes, the existing door and how it is mounted, and whether the door is interior or exterior. There is an electromagnetic locking device for just about any application, but it's not always easy to choose the best one.
Before dealers even start to consider buying an electric locking device, they should know what the local codes permit and require. Some jurisdictions do not allow the use of electromagnetic locks. However, electric strikes are widely acceptable. In many cases, codes require latching hardware as well as electric locks.