Batseeker 3 Ultrasonic Bat Detector Lets you hear ultrasonic bat echolocation calls during flight and feeding! Ideal for educators, nature enthusiasts, and growing scientists. Explore the amazing world of ultrasonic sound. Hear ultrasonic sounds emitted by bats, rats, pollinating bees, jingling keys, a pin dropping, crumpling aluminum foil, tearing paper, rubbing fabric, popping bubbles, running water, LED and fluorescent lights, and computers. Easy to carry and use: no tuning is required. Includes built-in speaker and 3.5mm audio jack. Manufactured with environmentally friendly RoHS-compliant lead-free parts and solder. Discontinued: replaced by the Batseeker 4 (ASIN B074MTN5YG).