Meloson S8 Rechargeable AM/FM Shortwave DSP (Digital Signal Processing) Radio, MP3 Player & Portable Speaker with Built-in Micro SD/TF Card Reader DSP (Digital Signal Processing) circuitry for improved sensitivity, selectivity & exceptional distortion-free sound quality MP3 music player with built-in TF card reader (32GB maximum) and auxiliary input jack Energy-saving intelligent back-lit display turns on only when it's dark and radio controls are detected, such as a key press or volume adjustment Four tuning methods: Tuning knob, keypad entry, auto-scan & ATS memory tuning Sleep timer, built-in battery charger & standard 3.5mm stereo earphone jack for private listening