Uses 2 'AA' Size batteries. Standard Chrome plated brass. Standard laryngoscope handles that are compatible with all standard/conventional blades manufactured to ISO 7376 standards. The designs of these handles have been continually refined through many years of use the world over to minimize maintenance requirements. They are manufactured to exacting specifications from the finest materials to be durable and reliable. Warranted to be of good quality and free from defects in material and workmanship.