[1200mAh Rechargeable Battery] This portable personal CD player comes with a 1200mAh lithium battery. No need for AA batteries or to keep the charger plugged in! Use the included USB cable to fully charge it in about 4 hours. Portable and convenient to take anywhere and enjoy music. [Multifunctional] The CD player boasts various modern features. DIR: All files can be played repeatedly for MP3s; 4 Playback Modes: Repeat One, Repeat All, DIR, INTRO, SHUF. [More Compatibility] Highly compatible with CD, MP3 CD, CD-R, HDCD formats. AUX port connects to all audible devices with a 3.5mm audio input, such as speakers, headsets, or car audio systems, giving you more ways to enjoy your music. NOTE: Please check if your disc is rotating. It won't work if your disc format is incompatible. [Perfect Gift Choice] Small and handy music CD player with a classic black finish and a smooth appearance with a perfect LCD screen. It is the best choice for music enthusiasts, language learners, and expectant mothers, and the warmest gift for friends, family, and children. Key Lock: After playback mode and sound effects have been set up, you can toggle the power switch to the HOLD position to prevent accidental changes, for example, by children or in crowded places. Specification: Power source: DC 5V/1A, Micro-USB2.0 Standard Charging voltage: DC 5V/1A Operating voltage: 3.7V Power consumption: about 1.5W Battery: Lithium-ion polymer, 3.7V/1200mAh D/C conversion: 16Bit Sampling frequency: 44.1KHZ Frequency response: 20HZ-10KHZ Power output of earphone: 16mW+16mW/16-32Ohm Impedance of earphone: 32Ohm/16mW Supported disc formats: CD, CDR, HDCD, MP3 Shockproof time: CD 60 seconds/MP3 120 seconds or more Colour: black Material: ABS Size: 133 x 133 x 27mm Package Contents: 1 x Portable CD player 1 x 3.5 to 3.5mm AUX cable 2 x headphone 1 x USB cable Warm Tips: 1. Turn off the "HOLD" key before using it. 2. Never touch the device's lens. Always keep the disc tray closed to prevent dust from collecting on the lens. 3. The player is only compatible with CD, CDR, MP3, HDCD formats. 4. If the device cannot scan discs properly, use a standard commercially available cleaner to clean the optics. Other cleaning methods may damage the optics. 5. Clean the device with a clean, damp leather cloth. Do not use any cleaning agents. 6. When charging, make sure the power and charging voltage are DC 5V/1A. Too high a voltage can cause overload damage to the machine.