The SDC 463U is a heavy duty vandal resistant exit switch designed for indoor, outdoor, commercial and industrial egress applications. Constructed of stainless steel and utilizing piezoelectric technology, the SDC 463U exit switch is ideal for harsh or high traffic conditions. The weather and vandal resistant design ensures superior performance in virtually any environment. Also known as -463U Piezoelectric Exit Switch-Security Door Controls - 463U - Heavy Duty Push Switch The 463 series vandal resistant request-to-exit switch is made of stainless steel and billion-cycle piezoelectric push switch technology. The weatherized design ensures superior performance.