With a .96mm display screen on it and a coil based EM pump, this pump has a few different features. It's capable of generating different frequencies.  You can select which frequency suits you best. Frequencies from 1hz thru 19 hz will allow constant EM fields while 20hz thru 5000hz will pulsate at varying rates depending on the frequency that is chosen.   EM pumps seem to give energy to spirits and to attract them so use wisely.
 
colors will vary