DROK Bluetooth Music Beanie Sports/Running Headphones Hats Wireless Outdoor Hands-Free Bluetooth Knit Headsets Earphone Hat Cap with Built-in Stereo Speakers Stay warm and enjoy hands-free music and calls,perfect for outdoor sports running skiing skating hiking working out dog walking holiday travelling and so on,medium weight is perfect for spring,fall, winter V3.0+EDR bluetooth version; available for most of devices with bluetooth function Support power display on iPhone;bluetooth wearable/bluetooth hands-free/bluetooth stereo music/bluetooth audio remote control High quality built-in stereo speakers that produce excellent sound quality Fully washable (lust remove the Internal speakers from their pouches)