TF Capacity: Max support 32G (Not included) Powered By:1 x AAA Battery(Not included) Screen Size: 30x8.5(mm) Item Size: 95x25x16(mm) Net Weight: 52g Type:MP3 Player Music Format: MP3 Port: USB2.0 Port Audio Output: 3.5mm Instructions for use: Step 1: Install Micro-SD before using MP3 player, connect it to the USB interface of the computer, and wait for the driver to update automatically. Step 2: Format Micro-SD into FAT32 file system. Step 3: Store the MP3 file with the bit rate of 128kbps in the root directory of Micro-SD. Notice: Micro-SD should be formatted in FAT32 format TF card is not included,you have to use your own one(max support 32GB) Please confirm there is no battery before plug into the computer. Each Mp3 screen have protector film, no scratch. Colour:Black Material:Plastic Package Contents: 2 x MP3 Player(without 1xAAA battery)