Interlock of St. Louis is uses the Draeger Interlock® XT. This latest, high-tech device does not require "Humming" during tests, which means you don't have to worry about aborts.

The DRAEGER INTERLOCK® XT is designed with an absolute 100% detection of vehicle operation without a breath sample, making it the most dependable and precise ignition interlock device offered on the market today.

• The "XT" incorporates a graphic display.
• The "XT" offers special features for deaf people.
• The "XT" employs three button keypad.
• The Draeger Interlock XT incorporates a dual microprocessor system, one in the handset and one in the control box. Furthermore, the recorded data is stored in the control box.
• The Draeger Interlock XT incorporates infrared communication interface.
• Service and Emergency Access System.
• Parameter driven.
• Compatibility with dry-gas and wet-bath standards.
• Low mass, advanced electrochemical DraegerSensor
• Patented, check valved mouthpiece
• Performs under most extreme conditions
• Exclusive, multi-faceted tamper detection technology.
• 100% detection of a vehicle being operated without having passed a
  breath test first.