Regarding the LF3 laser:
Its use is described on the website. Just select its time and power (which will default maximum).
It is attached as a watch but on the inside of the wrist (preferably left)
The delivered accessories are dedicated for specific ear, nose or throat problems. Its daily use time must not exceed 3 hours per day.
The internal battery is charged with the supplied charger or any other USB chargers or commercial computer.
