The Humane Solution - This one pack OWLTRA indoor/outdoor rodent trap is a humane method for controlling populations of mice and rats, with a large interior size (11" x 4.33" x 3.9") and a trap entrance aperture of approximately 2.6 inches wide (too small for adult cats and most small dogs). Powered by 4 D batteries (eliminates up to approximately 60 rodents per set) or by USB cord as alternative power source. Outdoor Usage with Waterproof Grade IPX4 - Use outdoors only with the provided waterproof cover. Rated IPX4: protected from splashing water in any direction but not for submersion or use in standing water. For safe operation, always place the trap on a clean, dry, elevated surface - inspect after rainfall to ensure cover integrity and dry conditions inside. Two Ways of Powering - Use either 4 D batteries (not included) or USB cord as a power source. For USB operation, use a DC 5V, 1A (or higher) adapter or power bank; note this device does not charge internally and must remain connected to USB when powered this way. Each full set of 4 D batteries provides power for up to approximately 60 activations during normal operation. Sound & Light Alarm - Equipped with an LED indicator and sound alarm that activate when a rodent is captured, serving as a prompt to empty the trap. Convenient Bait Area - Place bait in the trap’s bait area (access via the bait door); apply with a toothpick/cotton swab to the floor, opposite the entrance. For best results, use high-protein options such as peanut butter or cheese. Inspect and refresh bait every 24 - 48 hours during active rodent presence, especially after rainfall or if bait appears consumed or wet.