Bluetooth 3.0 Speaker Hat Wireless Headset Earphone Mic Cap for Cellphone Hat Wireless Bluetooth Smart Cap Headphone Headset Speaker Mic (Grey) excellent sound quality stereo speakers V3.0+EDR Bluetooth version,available for most of devices with bluetooth function. Set-in MIC, available for cell phone to transmit the speaking phone to your audio devices Knitted material, one size beanie fit all heads,fashion and keep warm with answer the phone in winter Set-in Li-ion chargeable battery, charge via USB Cable, long stand-by time.