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Product Details: Persistent and stable wireless Bluetooth 4.0 connection. Fully compatible with mainstream Bluetooth-enabled multimedia devices such as mobile phone/tablet/laptop/desktop PC. Support 3.5 mm interface external audio play, which enable the wire-free convenience. Outdoor sports Bluetooth speaker for teenagers. There is absolutely something what you want. Ultra-quick NFC connection. To provide greater experience, the ultra-quick NFC function is added. Built-in MIC, HD hands-free voice chat. When the speaker and mobile phone are connected, music will stop once there is an incoming call. Press the answer button to turn on the hands-free chatting mode. Waterproof and dust proof External Interface: Micro USB interface, audio interface, TF card slot. Size: 68*181 mm（W: 2.6*L: 7.1 inch). Weight: 405 grams (with battery). Speaker system: dual-channel + low-frequency boost. Active Passive: Active. Adjustment method: Key. Storing: The maximum capacity of 32 G TF card support. Power supply: Built-in 1500 mAh polymer battery. DC 5 V 500 mA USB power. Unit: 1.5 inches (double horn). Output power: 3.0 W * 2, 4Ω. Range: 8 M-10 M (no obstructions).