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).