Zibaar Bluetooth Hat Bluetooth Baseball Cap, Bluetooth Cap Wireless Hat Bluetooth Headset Hat Combined with Bluetooth V4.1 Stereo Bluetooth Headset and Mic, Hands Free Talking for Cell Phones Latest Blutooth V4.1 Technology, with excellent stereo sound quality output, less power consumption, fast & steady connection with cell phones, tablets and other Bluetooth enabled music devides, wireless range up to 33 feet/10 meters. Certificated high quality rechargeable Li-polymer battery, promising over 5 hours of playing time/talking time and 100 hours of standby time. Micro USB charging cable included. Three buttons with all functions, Next Song/Previous Song, Volume Up/Volume Down, Play/Pause/Answer Call/Hang Off, Redial, Activate/Deactivate SIRI on iOS devices. One PVC sheet sewed under the PU patch control panel to resist rain water. With voice prompt when Power On, Power Off, Pairing, Connected, Disconnect, Low Battery, Max Volume. With battery power indicator on iOS Device One size beanie fit most heads. Most style beanies have a very warm polar fleece material lining. Beanie is washable, take out the Bluetooth Headphones from the pockets of beanie before washing. It's very easy to install and uninstall.