Our lightweight SB25 binocular features instant-focus optical system, which allows its user to instantly acquire objects without having to re-adjust the distance focus, while providing full 20 degrees field of view. This feature is great for hunters or bird-watchers trying to view the constantly moving wildlife. Binocular features lightweight body and it feels just like a daylight binocular with such features like inter-pupillary adjustment and individual focusing eyepieces. Unit features low-battery indicator.