MOCREONewest Portable Wireless 4.0 Bluetooth Audio Receiver Adapter TF Card Reading NFC-enabled A2dp Audio Stereo Receiver Music Adapter Hands Free Calling and Car Kit Supports(Black) BLUETOOTH CRS 4.0: Enables you enjoy the music from your mobile phones or tablets without wire restriction. You'll get reliable, high-quality sound. TF CARD PLAYING: Put your TF directly in this device, and double click the function key to TF card mode. You can use this even without phone or tablet connection when doing exercise. FUNCTION BUTTON: On/ Off/ hang up / Double-click to a TF card mode. Next track. Previous track. HANDS FREE CALLING: Answer the phone call by the receiver's MIC. Please don't use the MIC of your headphones' NICE DESINE: The divice was designed as circle one with our own patent:201530134775.3, very friendly and modern design. Meantime there is a LED indicator. The size: 1.97*1.97*0.69 inch. Buy this fantastic device you will also get a 1 year's guarantee