Spectrum High-Security Call Stations Tamper-resistant Correctional-Grade Call Stations accommodate the needs of high-risk areas such as jail cells, mantraps, interrogation rooms, and holding areas. Stations have rugged stainless steel construction and are designed to withstand environmental and physical abuse. Pressing the call button on the station will place a call to the Master Station, opening two-way, hands-free audio communication. Stations are available with a flush solid metal button or a red mushroom button.