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The M4S is an enhanced MP3 player for children and teens, featuring a refined parental control system. It enables you to block or unblock all applications (icons vanish when blocked), activate or deactivate WiFi and Bluetooth, and restrict USB file transfers or memory card access. It also incorporates a screen time limit that automatically locks the device after a preset period, along with an automatic ON/OFF timer to manage playing duration. The updated M4S arrives with popular apps pre-installed, such as Spotify kids, Spotify, Music, Audible, Pandora, Libby and HiBy Music. It supports most music formats, including MP3, WAV, FLAC, APE, OGG, M4A, AAC, WMA, MP2, and offers various song categories, such as Title, Folder, Artist, Album. This music player is upgraded to Android 9.0, delivering quicker performance, enhanced app compatibility, and smoother operation. The device includes both Bluetooth and WiFi for effortless connectivity with headphones, speakers, and car stereos. It ensures rapid pairing and stable connections, providing a smooth online and offline music experience. Bluetooth and Wi-Fi can be activated or deactivated within the parental controls. This digital audio player contains 16GB of internal storage and includes a memory card slot, supporting external memory expansion up to 512GB, compatible with SDXC, SDHC. This allows you to keep extensive collections of music, audiobooks, and videos. With a built-in 2000mAh battery and a USB-C charging port, the M4S delivers up to 50 hours of continuous music playback from a 2-hour charge. Its lightweight and portable design makes it ideal for travel, exercise, and on-the-go use. Please be sure to write down and remember the PIN codes you set on the player, otherwise you will be unable to access it