Features of the Time Timer® PLUS: The Time Timer® PLUS protects the red disk under a clear lens.The Time Timer® PLUS has a volume adjustable end signal and closed battery compartment.The centre dial for setting the red disk, its large digits and carry-to-go handle ensures ease of use for all ageslarge digitscarry handlepatented red diskadjustable volume (rear)centre dial for setting the diskclosed battery compartment (rear)fixed feettransparent protective lensvarious durations Time Timer® Plus blackTime Timer® Plus white Time Timer® Plus 5 minTime Timer® Plus 20 minTime Timer@ Plus 120 min