The motion sensor sound player's detection range is up to 4 meters (13 feet) with a 120° viewing angle. It triggers the sound to remind you when someone or an animal enters and moves within the monitored area. Music files can be customized; download MP3 or WAV music files via computer. (Recommend Windows 7) MP3 audio files can be played, either single tracks or multiple tracks. This product only supports USB data cable to replace voice, not TF card. The card slot is for decoration only. (Part of the sound has been downloaded for the original product, if you need to change it, connect to the computer to replace the sound) Perfect for indoor festival music decorations, Halloween and Christmas party fun music, entrance door greeting, running animal sound box or alarm. Install at front doors, window frames, driveways, and wherever you want to play music upon motion. Customize your chimes; your MP3 audio file plays automatically after the PIR sensor detects motion. Sounds the way you want! Included mounting screws, ball mounting accessories, USB cable. Powered by 3 AAA batteries (not included) and optional to connect to DC5V (USB cable included) for external power supply.