Portable Bluetooth Audio System. Top Loading Programmable MP3/CD Player. Plays MP3/CD, CD, CD-R, CD-RW. Built-in USB Input Allows You to Play Media Devices Such as an MP3 Player. 3.5mm Auxiliary Input for Most Audio Devices. Repeat One, All and Skip Functions. Dynamic High Performance Speakers. Battery Operation: 6V 1.5V x 4 – “C” Size, UM-2 Batteries (not included). Power Supply: AC: 100-240V/50-60HZ DC: 6V (4 x “C” Batteries). Power Output: 2 x 2W (RMS). Operation Temperature: +5? C + 35? C. Frequency Range: FM: 87.5-108Mhz. Supported Audio Formats: MP3/CD – Audio. Auxiliary Input: 3.5mm.