The motion sensor audio player has a detection range of up to 13 feet (4 meters) and a 120° viewing angle. When a person or animal enters the monitored area, it triggers a sound to alert you. You can customize the music files by downloading MP3 or WAV music files via your computer. MP3 audio files can be played individually or as a playlist. This product only supports a USB data cable for voice replacement, not a TF card. The card slot is for decorative purposes only. Some audio is preloaded with the initial product; if you need to change it, connect it to a computer to replace the audio. It's perfect for indoor music festival decorations, fun music for Halloween and Christmas parties, door greetings, driveway alerts, or animal detection. Mount it on your front door, window frames, driveway, or anywhere you want to play music. Customize the chime: your MP3 sound file will automatically play when the PIR sensor detects motion. Includes mounting screws, wall mounting hardware, and a USB cable. Operates with 3 AAA batteries (not included) and an optional DC5V power source (USB cable included) for external power.