This countdown and alarm timer combines three-button operation with large-size digits for easy viewing. Times may be set up to 20 hours in any minute increment. At zero, a 1-minute alarm sounds. Timer includes a Traceable® certificate (issued by an A2LA-accredited, ISO/IEC 17025 certified lab), which documents traceability to N.I.S.T. standards. Dimensions (H x W x D): 3½ x 2 x ½ in. Wt. 2 oz.