3m lead with probe. Max/Min and In/Out temperature recall feature with reset. Indoor range: 14¡ãF to 140¡ãF (-10¡ãC to 60¡ãC). Outdoor range: -58¡ãF to 158¡ãF (-50¡ãC to 70¡ãC). Operates on (1) "AAA" battery (included). Dimension: 2.5" (W) x 3.4" (H) x .83" (D).