Sennheiser HD 4.40 BT, Over-Ear Wireless Bluetooth Headphones – Black Bluetooth 4.0 wireless with aptX for true Hi-Fi sound NFC for fast pairing with compatible devices. Frequency response (microphone): 100 – 10, 000 Hz Integrated microphone for headset use Ear cup mounted call and track controls Foldable headband design for easy storage. Li-ion Polymer Battery
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