Once you’re ready to go, there’s the recommended skintest.
Turn on the unit. Check your skin using the scanner and unlock the Tria.
The test is to zap your skin in 3 spots, preferably using different power levels, and wait 24 hours to see how your skin reacts. If a burn develops, well, that would be bad. The enclosed literature states a certain percentage will react badly so it’s definitely worth the effort to do the test.
FWIW, I had no problems.
The tip of the laser is a triangle – an inch or so on each side. In the center is a 1/2″ diameter circle. This is the laser size.
Once the laser is on, sensors in each of the 3 corners must come in contact with the skin for the laser to activate. A beep tells you the machine has made contact. A second beep tells you the laser has fired. If anything interrupts the laser, you’ll hear a buzz instead. Expect challenges around bonier areas, like knees.
To treat your skin, you have to apply the laser in overlapping circles. According to Tria, you should expect to treat 1 sq inch with 50 or so zaps with the laser.
At this point, if you’ve done the math, you’ll probably realize the biggest challenge you’ll face is the amount of time it will take to treat any given area.