The Door Detective Compact from Smarter Security Systems of Austin, Texas, protects open doors from tailgaters and other unauthorized entries. The new smaller, lower-cost model is also more durable, with stainless steel head units. LED lane-status indicator lights flash green or red to convey authorization or alarm. The right-hand unit accommodates a proximity or iClass reader within the unit, reducing clutter at the door. The device forces each person to use identification, and it detects tailgaters and direction violations. Upon alarm, it can trigger cameras, lock adjacent doors, or sound a remote alarm.