The door viewer is easy to install, well-made, and provides a clear wide-angle view. The interior viewing hole is a good size for looking out, and the rotating cover helps ensure privacy and security. Features: - Material: Zinc alloy - Size: Approximately 7.00 x 5.50 x 5.50 cm / 2.75 x 2.16 x 2.16 in - Battery: 2 x AAA batteries (not included) - Provides a wide field of view after installation, offering enhanced security for you and your family - Modern design suitable for use as a security door viewer or peephole - High-quality construction and sleek appearance enhance both functionality and appeal - Ideal for use in homes, offices, hotels, and front doors - Allows you to see, monitor, and identify individuals outside your door when the doorbell rings before opening, improving privacy and safety Instructions for use: 1. Open to the left or right 2. Use your finger to gently press the battery compartment, remove the inner core, then insert 2 AAA batteries into the inner core 3. Reinsert the inner core into its original position and press firmly until it locks in place Note: The inner core operates in a cycle. Click to release and press to lock Package list: 1 x Door viewer