LA CROSSE Atomic Alarm Clock w/ Temperature Weather Monitor Functions: Outdoor Temperature, Time, Indoor Temperature Transmission Range: Up to 100 Feet Protective Qualities: Weather-resistant Power Source: Corded Electric, Batteries Display Unit Power Source: Electric Sensor Power Source: Battery Dimensions: 2.87 " H x 7.09 " W x 3.62 " D Battery: Required, not included: 2 alkaline AA