TUNES2GO Plain Knitting Bluetooth Beanie is a unisex size that fits everyone and is ideal for all outdoor situations, while the built-in Bluetooth headset allows you to enjoy music or take calls on the go. Wireless Bluetooth Beanie offers you a different winter happy time. The upgraded wireless hat adopts tip-top Technology for Faster and Stable signal transmitting; enlarging the volume output range for better sound quality; The built-in microphone lets you talk on the phone hands-free. You will not regret choosing us. Enjoy the music and pick up phone call via fashionable knit beanie Bluetooth V5.0 + EDR Built-in Mic to make hands-free phone call High quality certificated rechargeable Li-ion battery (100mAh) Listen to music up to 6 hours for 2 hours charging Standby time over 60 hours High-performance compact speaker with clear and crystal sound Speaker dimension: 30mm S/N (A signal-to-noise ratio): >90db Frequency: 20Hz - 20KHz Impedance: 32ohm Tunes2Go Plain Knitting Bluetooth Beanie Hat