Efitty&reg; Adjustable Wireless Stereo Bluetooth Headphone with FM Bulit-in Mic Supprot TF card,Mico-SD,Web chat,Skype calls for cellphone Tablet Laptop Notebook Support MP3 /MAV formats,3.5mm Audio input slot. Bluetooth version: V3.0+EDR ,Operation Range: Up to 30 feet. Built-in Microphone,with Handfree function,Web chat and Skype calls. Support Micro SD card/TF card input slot up to 32GB,Data transmission function,can copy music to MP3 player. FM radio function,Frequency:87MHz-108MHz,Signal to noise ratio:90DB.Adstjuable for Adult and Kids, folding for traveling and using easily.