Built by Rafael Advanced Defense Systems, the full system is made up of three parts, all of which are relatively portable.
A radar unit watches for threats in a radius up to about 40 miles.Information on spotted projectiles is passed to a Battle Management and Control truck, where the information is evaluated and the command is given to either intercept or ignore. The projectile data is then passed to the interceptor unit, which launches a missile programmed to cross paths with the incoming rocket or shell, and detonate it in a way that is as harmless as possible.
The Iron Dome batteries simply ignore projectiles that are predicted to land in unpopulated areas like farmland or water. So while hundreds of rockets have been allowed to strike Israeli soil, comparatively few of them are causing serious damage or casualties.