In the past, there were basically only foreign brands of AEDs available, but in recent years, domestic brands of AEDs have gradually begun to multiply. Foreign AEDs include Philips, Philco-Medtronic, Zoll, Promethean, Japan Photonics and other old brands. Domestic brands to Merry the earliest to join the market, due to the history of several years, so the product credibility is higher; now there is also a long heart medical also have AED product production. For the current AED devices, the basic situation is through the biphasic wave discharge, with voice guidance for use, most of the equipment is similar to the use of the same method (untrained people can also be guided by pictures and voice prompts to use). Because the purchaser needs to consider more cost-effective, we do not explore other specific issues here, we recommend that the combination of practical contact with the manufacturer before choosing.