①. CD Player with Bluetooth 5.1 This CD player features Bluetooth 5.1 technology, allowing you to connect your car stereo via AUX or Bluetooth, as well as your Bluetooth radio or other Bluetooth devices. ②. Shockproof model, this portable CD Walkman has a shockproof chip to prevent interference. This model prevents damage to the disc or Walkman CD player while traveling, commuting, exercising, etc. ③. Rechargeable CD player, this portable CD player has a built-in 1200 mAh rechargeable battery, so you don't always need to connect the charging cable to a power source or replace the battery, and it can be fully charged in about 3 hours via USB. Comes with a charging cable that works for up to 7 hours, so you can take it with you for a walk or when traveling. ④. This portable car CD player is easy to use. Suitable for music lovers and language learners, as well as a gift for friends and children. Please note that Bluetooth compatibility with any external device cannot be guaranteed. It must be connected to all headphones or Bluetooth devices in your car.