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Three Connection Methods Bluetooth Connection Mode: Compatible With Mobile Phones, Tablets, Notebooks And Other Bluetooth Devices TF card: Insert The Memory Card, You Can Listen To The Music You Downloaded Wired Connection: The Earphone Is Out Of Power, It Can Be Used By Pling In The 3.5MM Audio Cable Feature Bluetooth + MP3 function support stereo music playing, phone calling. Support all audio devices that have Bluetooth capability, such as, cell phone ,tablet PC,laptop,computer etc. 3.5mm audio jack, provides a simple wired connection of a variety of devices without Bluetooth. Allow you to answer or reject phone calls anytime and anywhere. Charged via USB, rechargeable battery, convenient and practical. Playing time up to 8~10 hours, and continue talk time up to 8 hours, standby time up to 148 hours. Good quality, foldable design and adjustable length hinges, very comfortable to wear and easy to carry. Best choice for listening music, watching movie, chatting online etc. Specifications Bluetooth Version V5.1 Effective range 10M Speaker size 40mm Voltage 3.7vdc (400 mAh rechargeable battery) Talking time 8 hour Music time 6 hour Charging time 1.2 hours Package Included: 1* Headphone 1* Charing cable 1* Audio cable 1* Manual