The bracelet checks for traces of alcohol in the air above the user's skin. Any effort to tamper with the 10-ounce device immediately sends out an alert.
The monitoring company reports to the Los Angeles County Probation Department and Revel who is hearing Lohan's case.
In a May 24 court hearing, Revel ordered 23-year-old Lohan not to drink any alcohol and required her to wear the monitoring device. The actress was also ordered to undergo random drug testing in California and attend once-weekly alcohol education classes.
The actress has been on probation in the wake of two car incidents in 2007. She crashed a 12-cylinder Mercedes-Benz on Sunset Boulevard on May 26, 2007 while intoxicated, and also pleaded guilty to cocaine use in an arrest in Santa Monica on July 24 of the same year.