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The over-ear headphones develop a rich, deep high quality sound. With a softly padded headband and memory foam ear cushions, it stays comfortable over your ears. You can enjoy your own quiet time with the active noise cancelling headphones or listen to your favorite music or have a phone talk with your business partners/friends. Four modes of using this over-ear headphone 1. The Wireless mode: pairing to your smartphone or other devices that support Wireless; a built-in rechargeable 300mAH battery provides up to 4 hour music / talking time in a single charge. 2. The Wired mode: you can also use it as a wired headphone with the provided AUX-in cable so the headphones will never power off. 3. Micro SD Card Playback mode: insert a Micro SD card and you can play music in the SD cards. 4. The Radio mode: you can switch the headphone into radio mode and listening to local radio stations. Product Parameters Version: V4.0 Support Profile: AVRCP1.3, A2DP1.0, HFP1.5, HSP1.0 Working Distance range: 10m (about 30 feet) Frequency Range: 2.402GHz-2.480GHz Battery Specifications: 3.7V, 300mAH, built-in rechargeable lithium battery Charging Voltage: DC4.2 -5.5V Charging time: about 1.5 hours Talking/Music Time: about 5 hours Standby Time: about 30 hours Package Included 1 x Foldable Over-ear Headphone 1 x USB Cable 1 x AUX-in Cable 1 x Manual