A basic necessity, these entry-level winders are compact and lightweight. They are ideal for use in safes without the need for a plug-in adapter. Equipped with Orbita long-lived lithium D cell batteries operating on the 8-minute winding cycle, the batteries will last for many years without the need for replacement. Even longer life may be accomplished by using the 12-minute or extended-winding cycle, which is easily selected using the toggle switch located behind the mounting cup.