Red section shows the time remaining. New version with dry-erase card for tasks and schedules. The card slides into a holder on the clock. "Pocket" requires 1 AA battery, "Medium" and "Large" each require 2 (not included). End sound can be switched off. LxW (Pocket): 7.5x7.5 cm. LxW (Medium): 18x18 cm. LxW (Large): 30x30 cm.