Timeguard TGBT6 - Manual (Page 4)

4
If it is less than 15 seconds since the Boost button was pressed the
boost may be stopped at any time by pressing the Boost button
repeatedly until all the LED’s are extinguished. After 15 seconds the
boost may be stopped by a single press of the Boost button.
The boost period may be changed at any time by pressing the Boost
button until the required time LED is lit. In which case the indicated
boost time will start from when the Boost button was pressed.
If the button is pressed and then held the LED’s will cycle upwards
with 1 second between each change. It will go in the sequence 1/4,
1/2, 1, 2, OFF, 1/4, 1/2 etc.
Stopping or Increasing Boost