Topfield TF3200IR User Manual page 20

MENU OPERATIONS
D. Wakeup Channel
The Wakeup Channel item automatically turns the STB to the preset
channel when it automatically turns on by the Wakeup function.
E. Power Off Time
The Power Off Time menu sets the time of the STB automatically turns off.
F. Sleep Time
The Sleep Time item is similar to the Power Off menu. The Sleep Time
function turns off after the adjusted sleep time.