4-Channel Digital Timer Clock Timing Device With basic clock function, press "clock" into clock mode and "T1-T4" button for countdown or countup mode Build-in different rings for the 4 channels, easy to distinguish The 4 channels can time simultaneously or respectively, maximum countdown time is 99 hours, 59 minutes and 59 seconds, minimum countdown is 1 second Directly enter into timing mode once it's turned on, hour/minute/second respective key to operate with ease