The 4 channels can time simultaneously or respectively， maximumcountdown time is 99 hours， 59 minutes and 59 seconds， minimumcountdown is 1 secondWith basic clock function， press "clock" intoclock mode and "T1-T4" button for countdown or countup modeBuild-in different rings for the 4 channels， easy to distinguishCanreset and clear by one keyDirectly enter into timing mode once it'sturned on， hour/minute/second respective key to operate witheaseAttached with magnet， bracket and installing holes， easy tomount or hanging on metal surface and desk Accuracy at normaltemperature: u00b130 seconds per monthDisplay contentsTimers: 4SettingUnit: secondsSetting Range: 1 second to 99 hours， 59 minutes and 59secondsBeeper: 1 minuteElapsed time measurement following end ofcountdown (display in 1 second units up to 99 hours， 59 minutes and59 seconds)Operating Temperature: 0~40u2103Powered by: 2*LR44 BatteryApproximate Battery Life: 1 year (30 seconds of beeper operationper day)Product Size: Approx.9*6.8*1.4cm (L*W*T)Color: As shown