The red disks for the Time Timer PLUS® and MOD® have a clear edge and will sometimes appear as though your timer can only be set to 59 minutes. Improved models of the Time Timer PLUS® and MOD® include a clear tab on the outer edge of the disk, to remedy this appearance.
The optional beep at the end of timing may also seem to be delayed by a few seconds because the entire disk, including the clear edge, must complete the rotation before time will be up.