Large digits permit viewing from across the lab. When counting down, green LED flashes every second for the last ten seconds; red LED flashes when zero is reached and the alarm is sounding. Adjustable alarm volume has three settings: high, low, and off. Timer also Counts up showing elapsed time after zero was reached. Features magnetic back, flip-open easel stand, spring fastener for clipping, and an opening for a lanyard. What’s included: nist-traceable calibration report supplied by the manufacturer and two AAA batteries. Green LED flashes for the last 10 seconds, then flashes red at zero store three countdown times in memory for your most common uses