Recording operation is simple: Press and hold the record button, align the recording hole to create a sound, release the button to broadcast the recording when finished. Multiple Voice Recordings: Recording time is 30 seconds. You can record more than one voice, and the previous voice will be automatically erased when the recording is full. Accurate and Wide Detection Angles: With a 120-degree PIR wide-angle sensor, this sound player detects motion from up to 13 feet (4 meters) day or night and plays a loud and clear recording. Good Sound Quality: Adjustable sound level, 8-ohm speaker, clear sound. Fully featured yet lightweight and small (only 5cm x 7cm). Endless Applications (for indoor use): Perfect for the elderly or people with memory loss needing reminders, in-store advertising, exhibitions, trade shows, door guards/greeters, providing instructions while away, or blocking embarrassing bathroom sounds. Requires 3x AAA 1.5V batteries (not included), or power supply via USB power adapter (DC5V) (not included).