With overload protection on all ranges, 3.75 digital liquid crystal display (LCD), maximum reading 3999. Maximum 450 V. Built-in test leads, 2X per second sampling rate. Auto-power off after approximately 10 mins. Operating environment 32 to 104 deg F. Storage temperature -4 to 140 deg F. 300 hrs typical life with carbon zinc batteries. Operates from (2) LR44 batteries, included. C-77 booklet style carrying case and operating instructions included. cULus Listed to both US and Canadian standards. Meets CE requirements. 4-1/4 in H x 2-1/4 in W x 1/2 in D.