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【Programmable Sound Module】Provide more possibilities to develop a module perfectly suited to your own project. You can select different trigger modes (TTL button/trigger) by connecting with different soldering pads. 【Control Button】 Install it in your project/gift, then press the button. Your music you have inserted will be played once and will automatically stop at the end of the song. 【With AA Battery Box & USB Cable】This kit contains with an AA battery box and a USB cable, with which you can more easily provide 4.5-5V power and which is also used for different USB devices to download the MP3 audio file into the internal storage memory. 【8MB Memory】Built-in 8M memory with micro USB port, you can update the music simply using a USB cable for smartphone. It is recognized by the computer as a USB player, just like an MP3 player, and you are free to add any MP3 audio file to the storage memory as long as it does not exceed the 8MB limit. 【Perfect Creative Gift】It is ideal for creating music box, musical greeting cards, photo frames, album, gift box and other creative gifts for Mother's Day, Valentine's Day and Christmas.