ALERT™ J4X Professional breathalyzer

ALCOLOCK is committed to offering top-quality products that we develop ourselves. We aren’t satisfied with offering a single device or reselling an existing line of products. Instead, we are committed to immersing ourselves in the industry. Over the years, we’ve established a reputation for being experts in our field. We’ve stayed at the top of the industry by developing a wide range of high-quality products that span the entire gamut, from lab equipment to devices that aid program facilitators to the breathalyzers and products the consumer uses throughout their program. The ALERT J4X is one of the quality products we offer to help make the road to license reinstatement and independence as easy as possible.

ALERT J4X Basics

The ALERT J4X is a professional breathalyzer trusted by law enforcement professionals across the world. The device uses fuel cell sensor technology to ensure that every test you administer returns accurate results in a short amount of time. The ALERT J4X operates by pressing a single button, meaning you get your Breath Alcohol Content (BrAC) results quickly and easily. What’s more, every device comes with a starter set of the accessories you need to get started. Volume purchasing options are available for agencies and departments, as well, should you need more than one device.

ALERT J4X Specifications

The ALERT J4X comes with everything you need to get started right away. Each device comes with a kit including the device, two AA batteries, a DC adapter, 5 mouthpieces, an instruction manual, and a durable carrying case. Law enforcement professionals worldwide have come to love the J4X for a variety of reasons. Here are just some of the benefits you can expect when you purchase the ALERT J4X breathalyzer.

  • 1-year warranty
  • DOT certified
  • Electromechanical sensors for accuracy
  • 30-second test results
  • Single-button operation
  • Calibration reminders
  • Only required to calibrate once per year

ALCOLOCK’s ALERT J4X is just one of the many high-quality products and services we offer. Are you a driver looking for ways to more efficiently complete your program? Maybe you’re a service provider seeking to expand upon your existing line of product offerings to better serve your client base. No matter who you are, if you’re involved in the license reinstatement and ignition interlock process, we have many options that can help you reach your goals. Check out our shop for more outstanding products and services developed to help you succeed.  

mouthpieces, instruction guide and a durable carry case.

  • 1 year warranty offered to ensure that your device is taken care of.
  • DOT certified breathalyzer.
  • Industry trusted electrochemical sensor provides you with accurate test results every time.
  • Saves you time with results available within 30 seconds.
  • One button operation so it is easy to use.
  • Displays a calibration reminder for your convenience.
  • You will only need to calibrate it once in a year.
Handset size135 mm x 59 mm x 30 mm
Handset weight115 grams
SensorElectrochemical (fuel cell)
SpecificityAlcohol only, no response to ketones or hydrocarbons
Ambient temperature-20°C to +50°C
Initial test< 45 seconds
Breath sample5 seconds
Recycle (recovery) time< 90 seconds
BAC resultmg/L
Range of measurement0 to 500 mg % (0.00 to 0.50 % BAC)
Accuracy± 5 % @ 100 mg % (± 0.005 @ 0.10 % BAC)
DisplayLCD display with LED mouthpiece manifold
Battery2 AA batteries
MouthpieceDisposable (95-000145)
CalibrationALCOSIM™ or equivalent
Last test recallYes
Complete packageCase, DC car adaptors, mouthpieces
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