1＞ Bluetooth 5.0 Function -Personal CD player support Bluetooth version 5.0. High-speed and stable transmission and high anti-interference ability enables easy use both indoor and outdoor and assures pleasant wireless music playing experience. You can play the music through bluetooth speaker or bluetooth headset. It can also supports AUX connection with other audio devices via 3.5mm audio input.（NOTE: Not work with car bluetooth, smartphone） 2＞ Rechargeable -Equipped with a 1000mAH rechargeable battery. It can easily run about 10 hours when the battery fully charge. Portable and convenient, can be carried anywhere. 3＞ Ear-protection Design & Anti-shock - The cd player is designed with a default volume when turned on to offer ear protection. Long press the ear button for 3 seconds, the LED display will show “HIGH”, then release the button and press again to increase the volume. Adopts anti-shock and electric skip protection tech, 45 seconds anti-skip protection for CDs, 120 seconds anti-skip protection for MP3 CDs, ideal to play your favorite song on cd on the go when walking moving. 4＞ Wide Compatibility -Compatible with most of the format such as CD, CD-RW, MP3, CD-DA and WMA audio files from CD, support AUX connection with all other audible devices via 3.5mm audio input jack. EQ effect mode includes BBS, POP, JAZZ, ROCK, CLASSIC style. 5＞ Perfect gift -Compact palm size: 5.6"x5.6"x1". A good choice as a player in the classroom-kindergarden/primary school. Language learning, prenatal education,antenatal training, CD/MP3 music play. It is the best choice for prenatal training, language learning etc. Personal CD player is perfect choice as a gift. Specifications: Bluetooth Version: V5.0 （NOTE: Not work with car bluetooth, smartphone） Working distance: 33ft/10m without barrier Input：USB 5V/1A Output power: 20MW (32Ω Double Channel) Lithium Battery: 1000mAH Power Supply Ways：USB charge Format Support: CD, CD-RW, MP3, CD-DA, WMA Display: LED Screen Headphones: 3.5mm Dimension:14.2*14.2*2.5cm Weight:220g Sound Effects: Normal, BBS, Pop, Jazz, Rock, Classic, etc. Frequency Response: 20Hz Signal Noise Ratio: ≥80dB Package Included: 1xBluetooth Rechargeable CD Player 1xEarphone 1xUSB Charge Cable 1xUser Manual Attention: 1. Please turn off the ""hold"" key at the back of the CD before powering it on. Press the power button to star playing the CD. 2. The keys on the device are locked and LCD will display ""HOLD"", then disappear. May be misunderstood machine can not boot. 3. "DISC" will appear on the screen if invalid CD inserted. Please replace the CD disc in the supported format. If the disc format is supported, please try restarting the player. 4. The condition of the disc (scratches, debris, cracks, ect.) will impact the performance of the device. (Only support CD disc) 5. The player has not built in a speaker, you need to connect headphones to hear the sound. Or connect Bluetooth speaker /Bluetooth headset. 6. sudden exposure to high level music may result in hearing loss. The cd player is designed with a default volume when turned on to offer ear protection. Long press the ear button for 3 seconds, the LED display will show “HIGH”, then release the button and press again to increase the volume.