Plastic Motion sensor sound player detection range up to 13ft (4m) with a 120° viewing angle. It triggers sound to remind you when someone or an animal enters and moves within the monitored area. Customizable music files, download MP3 or WAV music files via computer. (Windows 7 recommended) MP3 audio file playback, single track or multiple track playback. This product only supports USB data cable for voice replacement, not TF card. The card slot is for decoration only. (Some audio has been pre-loaded for the original product; if you need to change it, connect to your computer to replace the sound). Indoor festival music decorations, Halloween and Christmas party fun music, entrance greeting music, choir animal sound box, or alarm. Install on front doors, window frames, driveways, and anywhere you want music triggered by motion. Customize your chimes, your MP3 audio file will play automatically after the PIR sensor detects motion. Sounds just the way you want it! Includes mounting screws, ball mount accessory, USB cable. Powered by 3 AAA batteries (not included) and optional connection to DC5V (USB cable included) for external power supply. (If you have any questions about the product, please contact us immediately and we will reply within 24 hours.)