AiM MyChron3 Basic - Manual (Page 13)

13
To activate this function, open the Beacon transmitter with a screw driver and
move the jumper ( located directly below where the battery pack is attached to
the beacon transmitter board ) over either one of the two connectors ( for low
power mode ) or over the two connectors ( for high power mode ).
When the Beacon transmitter operates on high power mode, both the power led
lights will light up when the transmitter is turned on.
Please, take note that, in High Power Mode, the transmitter has to be
powered by an external 12 Volts battery.