4 independent channels each of which counts up or down for any interval from 1 second to 100 hours. Extra large display indicates channels in use. Each one has a distinctive 1 minute alarm. Automatically begins to count up to indicate time setting for reuse. Also has a clock mode. This unit comes with a stand, pocket clip and a magnet. Also available with NIST traceable certificate of compliance. Dim: 2-7/8" x 2-1/2" x 9/16". Weight: 2 oz.