SFP MP3 player 4408BK is an 8 GB MP3 player featuring a micro SD slot and headphones. It has a 1.1-inch LCD display, a micro SD card slot (supports up to 128 GB), and FM radio. The player supports MP3 and WMA formats and includes USB disk functions with a micro USB input (supports FAT32 and exFAT). It has a rear buckle for easy attachment and a button lock function. The device can record in WAV format and offers a battery life of 7 hours at 50% volume and 5 hours at 100% volume. It features a multi-language menu and has a built-in rechargeable battery (3.7 V / 110 mAh) that charges via USB cable.