Bluedio R+ Legend Wireless Bluetooth Headphones with Mic & Micro SD Card Slot, Revolutionary 8 Drivers Deep Bass (Silver) Bluedio PPS8 8-driver technology delivers deep, powerful sound for the music you love. Vacuum painting technique creates three stunning colors for you to choose from. Up to 25 hours of Bluetooth playtime from rechargeable battery on a full charge If the battery runs out, you can still enjoy music with included aux cable plugged in. Micro SD card support when you don't want to carry your phone. *note: SD card not provided