H-B DURAC Single Channel Electronic Timer with Triple Alarms and Certificate of Calibration (B61700-3600) CE approved, RoHS compliant, Includes Statement of Traceability indicating accuracy traceable to the National Institute of Standards and Technology (NIST) Perfect for high noise locations, vibration, light and loud buzzer sound alarms Switchable timing capacity 19 hours 59 minutes/99 minutes 59 seconds; Count Down/Up Pocket clip, Foldaway Stand and Magnetic Attachment Requires two AAA batteries (included)