[1200mAh Rechargeable Battery] The portable personal CD player features a 1200mAh lithium battery, eliminating the need for AA batteries or constant plugging into a charger. You can easily charge it with the included USB cable, taking about 4 hours for a full charge. It is portable and convenient for enjoying music anywhere you go. [Multifunctional] This CD player includes a variety of modern features. DIR: All files can be played back repeatedly for mp3; 4 Play Modes: Repeat a track, Repeat ALL, DIR, INTRO, SHUF. [More Compatibility] It is widely compatible with CD, MP3 CD, CD-R, and HDCD formats. It has AUX input for connecting with any audio device with a 3.5mm connection, such as speakers, headphones, or a car stereo, giving you more options to enjoy your favorite music. NOTE: Please ensure your disc is rotating. If the disc format isn't compatible, it will not work. [Perfect Choice as a Gift] This small and handy music CD player in classic black features a smooth design with an excellent LCD display. It is an ideal gift for music lovers, language learners, expectant mothers, and a thoughtful present for friends, family, and children. [Key Lock] After you set up the playback mode and sound effects, you can switch the power to the HOLD position to prevent disruptions from the environment, such as curious children or crowded spaces, from altering the player settings. Specification: Power source: DC 5V/1A, Micro-USB2.0 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 headphones 1 x USB cable Warm Tips: 1. Please turn off the "HOLD" key before using it. 2. Never touch the lens of the device. Always keep the disc compartment closed to prevent dust accumulation on the lens. 3. The player only supports CD, CDR, MP3, and HDCD formats. 4. If the device has trouble reading discs, use a commercially available cleaner to clean the optics; other cleaning methods may damage the optics. 5. Clean the device with a clean, damp cloth. Do not use any cleaning agents. 6. When charging, ensure that the power source and charging voltage are DC 5V/1A. Excessive voltage may cause damage to the device.