In order to be applicable to different power supplies, the frequency of device
is selectable as 600Hz、800Hz、1000Hz、2000Hz、4000Hz、8000Hz with
default frequency 1000HZ. Once short pressing “Reset” key, the frequency
will switch into the next one. The indicator will flash in White color and resume
to previous color after “off” for 2 seconds. The rule of indicator flashing times
for different frequency please refer to table.