The purpose of Lightning Surge Protectors is to protect electronic equipment such as cell phone signal booster systems from lightning strikes. Lightning surge protection devices are sometimes called Surge Arresters. Inline lightning protectors and surge arrestors are designed to connect to the coax cable of a signal booster system. The surge protector is attached to the cable joining outside antenna to the cellular amplifier. They can be placed just before the cable enters the building or they can be mounted at the outside antenna. Note that your surge surge arrester will require a ground cable. It is important to carefully read all instructions prior to installation or preferably request a professional installation by certified installer or electrician with license to perform services in your area. We carry more lightning surge protectors including accessories such as replaceable gas discharge element.