Key by JOPEN Halo enhancer. 5 patterns. Sililcone. Uses (1) AAA battery. Waterproof. One year warranty. Soft, lint-free pouch included. 1.25 “/3.25 cm (ring diameter). 2″ x 1.75″/5.75 cm x 4.5 cm (overall). 2.25” x 1″/5.75 cm x 2.5 cm (stimulator).