Sold as each. 7/8"L x 1"D x 4-1/4"H. Up to 150 foot range. 128 selectable security codes. Battery operated (lithium batteries included). Battery life expected to be 10 years or more. Weatherproof. Satin brass finish. Clamshell. Manufacturer number: 3209848. Country of origin: China. Distributed by Heath Zenith.