TrignoTM Personal Monitor User’s Guide27re-indexed and the data files screen is displayed. The time to deletea file is proportional to the size of the file. Buttons on the device aredisabled while a file is being deleted.It is not recommended to power down the device as data changes arein progress. Doing so may result in data corruption. Wait for theprogress bar to complete before attempting to power down the deviceFigure 26: The file deletion process.Setup Options (Main Menu)The device options can be set by selecting the Menu function fromthe home page, followed by the “Set-up options” function. Followingoptions are available:Button Lock: When engaged this feature will lock all buttons onthe TPM during a test, so that inadvertent button presses will have noeffect on the device behavior. The lock is released by simultaneouslypressing the left and right arrow keys, as stated on the screen.Alert Volume: Audio prompts and alerts are accessible on theheadphone port. The volume for these can be set between 0 (muted)to 6 (highest).Backlight Level: The screen can be set to 3 levels of brightness.Power consumption increases with screen brightness.Backlight Time-Out: when engaged, this feature will turn thescreen backlight off to save battery power, after the number of select-ed minutes expires. Any button press will turn it back on.Power-Down Time: when engaged, this feature will power down