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This works great for keeping warm and having nice tunes playing right into your ears. Recommend and makes great Christmas gifts for your family. This Bluetooth hat will accompany you on all your cold excursions.Bluetooth hat parameters: Frequency range: 20-20KHZ Sensitivity: 95dB Impedance: 32Ω Speaker size: 32mm Transmission distance: CLASSII Operating range: 10M Charging time: 2H Listening to the call duration: 8-10H Battery: 200mA polymer lithium battery Accessories: data line + manual Bluetooth protocol: 5.0 Bluetooth search name: BT-01