Siemens believes today's residential surge protectors come up short when protecting today's modern homes filled with smart appliances and electronics. Selecting a Siemens FirstSurge surge protective device (SPD), available in 3 protection levels FirstSurge Power (FS060), FirstSurge Pluse (FS100) and FirstSurge Pro (FS140), is key to ensuring your home remains protected. When installed directly to the outside of any 120/240V branded load center (electrical panel equipment), Siemens FirstSurge surge protective device fitted with our FirstSurge Flush Mount Kit, provides protection from damaging transient voltage surges and spikes. Also, when there is a problem, Siemens FirstSurge device takes the guesswork out of knowing when it is time to be replaced via LED's and audible alarm. Siemens FirstSurge surge protective device sold separately. Note: This device must be installed by a licensed electrician to ensure complaince and proper installation.