That's right, every time the applet is changed, the device returns to the default 30-40% power if that applet has not been used previously. Changes are stored in frequency memory for the next time that program is used. The proper power percentage varies by user. There are people with greater sensitivity to electricity who need to adjust it to a minimum, while others may need maximum power to perceive any sensation. In fact, some programs use frequencies so low that they can go unnoticed. The possibility of increasing the intensity is designed to improve conductivity, as some people may experience constant beeping if the equipment does not detect a proper connection, which would require increasing the intensity. The ideal experience is when a soft tickle is perceived. However, in certain programs, you may not notice any sensation, since the Biotrohn device works with microfrequencies.