Paococ Bluetooth 3.0 Wireless Stereo Headset/Headphones With Bulit-in Call Mic/Microphone For Iphone /Cell Phone/PC/Tablet/Desktop/Laptop Bluetooth Wireless connnecting (Bluetooth version:V3.0+EDR) Handfree, With Microphone bulit-in,FM radio function, Frequency:87MHz-108MHz Operation Range: Bluetooth wireless connecting Up to 30 feet Support Micro SD card/TF card input slot up to 32GB Note: the operation is simple, there is no instruction manual, if you have any question, you can contact us to solve.