UPGRADED BLUETOOTH V5.0 VERSION: The HOTT portable CD player provides a more rapid and stable Bluetooth connection and can be easily paired with Bluetooth headphones or speakers. (NOTE: this item is not compatible with smartphones and may not be compatible with some car system Bluetooth). RECHARGEABLE BATTERY: The HOTT Bluetooth CD player comes with a 1000mAh Li-ion battery providing power for 7 hours at medium volume after a 3-hour full charge. Charging is done via USB cable. No AA batteries or external power source are needed. CONVENIENT: This lightweight CD player offers all standard playback features you would expect, including volume control, skip forward/back, play/pause, key lock, anti-shock, and more. Compatibility: CD, MP3, CD-RW, CD-R, and WMA. DIR: Only for MP3 disc. 5 Sound Effects: BBS, Pop, Jazz, Rock, Classic. ANTI-SHOCK PROTECTION: HOTT portable CD player with Bluetooth is designed with anti-shock protection, which provides a stable audio experience when moving, with up to 45 seconds anti-skip protection for CD and 120 seconds anti-skip protection for MP3. Colour: Black. Material: Plastic. Size: 13.97 x 13.97 x 2.54 cm. Package Contents: 1 x Bluetooth CD Player, 1 x USB Cable, 1 x Headphone, 1 x English User Manual. Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. A measurement error of +/- 1-3cm is allowed.