H-B DURAC 4-Channel Electronic Timer with White Board and Certificate of Calibration (B61700-3700) CE approved, RoHS compliant, Includes Statement of Traceability indicating accuracy traceable to the National Institute of Standards and Technology (NIST) Built in white board and dry erase marker with eraser tip (included) helps keep track of crucial information Counts Up To or Down From 23 hrs 59 min and can be Set in 1 Minute Increments Foldaway Stand or Magnetic Attachment Requires two AAA batteries (included)