【Built-in Speaker & HIFI Lossless High-Quality Sound】 Enjoy your favorite music with clear sound anytime, anywhere, even without earphones, thanks to the built-in speaker. With unique digital noise reduction technology, it achieves immersive HIFI lossless high-quality sound like a CD in various formats such as MP3, FLAC, WAV, and APE. 【Innovative Two-Way Bluetooth 5.3 Technology】 ① Transmission: Easily connect to your Bluetooth earphones or speakers and enjoy music wirelessly. ② Reception: Play music from your smartphone (Android/iOS) on this device. Furthermore, you can directly transfer music, photos, and other files from Android smartphones to this device. (Note: File transfer from iPhones is not supported) 【Ultra-Lightweight Design & Expandable to 128GB】 The ultra-lightweight and compact design, weighing only a few grams, makes it easy to carry. In addition to the 64GB built-in memory, you can expand the capacity up to 128GB with a microSD card. You can store approximately 30,000 music files, so you don't have to worry about running out of space. 【One Device, Many Functions! Abundant Features】 In addition to music playback, this device is packed with various functions, including FM radio (using wired earphones as an antenna), voice recorder, e-books (TXT format), image display, calendar, alarm, stopwatch, and pedometer. It's useful in all situations, from commuting to sports and language learning. 【Intuitive Operability & Easy-to-Understand Button Layout】 Based on user feedback about "difficult operation," we've achieved a simple and easy-to-understand button layout. The function of each button is clear, and you can operate it intuitively without a manual. Even those who are not good with digital products can use it with confidence. 【Easy Data Transfer from PC & Smartphones】 ① PC Transfer: Connect to your PC with the included USB cable and easily transfer music files by drag and drop. ② OTG Transfer: Using an OTG adapter (sold separately), you can transfer files directly from your Android smartphone. No troublesome steps are required. (Note: Apple devices do not support OTG transfer.) 【Long-Time Continuous Playback】 Continuous music playback for up to several tens of hours on a single full charge. You don't have to worry about running out of battery during long trips or outings.