Usage Tips:UPGRADED BLUETOOTH V5.0 VERSION: The portable CD player provides more rapid and stable Blue connection and be easily paired with Bluetooth headphone or speaker. (NOTE: this item is not compatible with smartphone and may not be compatible with some Bluetooth) RECHARGEABLE BATTERY: The Bluetooth CD player comes with 1000mAh Li-ion battery providing power for 7 hours at medium volume after 3-hours'fully . Charging with the USB cable. Does not need AA battery or external power source anymore. CONVENIENT: This CD player offers all standard playback features you would expect, including volume control, skip forward/back, play/pause, key lock, anti-shock and so on. / Compatibility: CD, MP3, CD-RW, CD-R and WMA. / DIR: Only for mp3 disc / 5 Sound Effects: , , Jazz, Rock, Classic. ANTI- SHOCK PROTECTION: potable 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, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.