This is the personal collar that produces a cooling breeze across the neck. The collar holds 4 oz. of water and its internal fan generates evaporative cooling across the back of the neck and base of the head. The interior of the collar is lined with aluminum that conducts a cooling sensation onto the back and sides of the neck. The collar weighs less than 1 lb. and its two spring-loaded hinges allow it to rest gently yet securely against the neck, ensuring comfort and stability. It has two adjustable fan speeds that produce a soothing whirring sound and it is powered by the included AA battery that provides up to four hours of cooling. Includes a water bottle for refilling the collar. 7 1/2" Diam. x 2" H. (14 oz.)