Features: Great sound from 57mm drivers. Support FM broadcast / Micro SD card playback of MP3 and WAV audio formats *note: Micro SD card not provided Up to 40 hours continuous music time from the latest Bluetooth 4.1 low-power technology The Bluetooth perfectly works with your smartphone, tablet or Bluetooth enabled MP3 player. Note: there may be compatibility issue with other devices. Product information: Black Item Weight 7.8 ounces Product Dimensions 3.9 x 5.9 x 7.9 inches Batteries 1 Lithium ion batteries required. (included) Item model number T2VBCA01 Wireless communication technologies Bluetooth, FM Connectivity technologies bluetooth, micro usb, usb Special features Foldable, Lightweight Weight 7.84 Ounces Colour Black Description: "When use Micro SD card playback, select the SD card mode Check whether the Bluetooth connection is successful. Bluedio T2 Plus comes along, a upgrade for H Plus. Besides keeping all the pros of the previous version, T2 Plus can fold up for easy carrying, and strengthened in headband. Pairing Tip When pairing, you need to make sure the headphones have entered pairing mode, here is how to enter pairing mode: When the headphones are off (If not, turn off the headphones first), press and hold the Power Button until you see the blue light stays on (instead of blinking). About Bluedio: Bluedio is a pioneer in portable audio device, providing solutions to professional audio and wireless communication. "