Bluedio R Plus Wireless Bluetooth Headphones with Micro SD Card Slot (White) Trendy &amp; Elegant Design: Elegant piano coating and mirror design over Bluedio R headset, leading headset design of 2013 1 year limited manufacturer warranty Supports Micro-SD Card Music Playing: You can play music of MP3 and WMA format through Micro-SD card (up to 32GB) Charged by Micro-USB | Bluetooth Frequency: 2.402-2.48GHz | Sensitivity: 120dB Bluetooth Technology with Easy Paring (no pin code needed) | Supports MP3 Players &amp; USB File Transfers | Noise Cancelling Technology