The hand helds are very popular and are the competitor lasers of the helmets. With the handhelds, you have to do the work of moving the laser over the different parts of scalp where you want to raise the voltage of the hair follicles.
Some of the hand helds have programs for each day. So, on Sunday it delivers different frequences than on Monday. Friday and Saturday will have different frequencies too so that the hair follicles can get charged at different speeds on different days so they don't adapt to the laser. It works the similar to the way as taking creatine if I wanted to build muscle. They say to not use too much and they also say to cycle off and not using for months and months without taking breaks. The hair follicles should never know what is coming and the way the follicles are charged by varying the speeds each time in a way tricks the follicles to grow hair. That is the way someone explained it to me.
See the video below where we show the hair setting feature on the hand held laser.