Kouba Systems of Bastrop, Texas, has released a new single-housing tailgate detection system with lock output relay. The system simplifies the installation process by eliminating the need for through-beam sensor alignment. The housing measures 6 by 21/8 inches and is powder-coated in black. The new tailgate (TG-L-BB) will generate an alarm when a person walks through the secured door or hallway without an access-granted signal from the card reader system. The lock output relay requires only one output for each card reader to grant access to the tailgate system and unlock the door. Optional features include a local warning alarm, a door-held alarm, a forced-door alarm, and a system bypass.