4W BT3900 4W, 8hr | Long Bluetooth range Waterproof IPX7, dustproof 14W BT7900 14W, 10hr | Long Bluetooth range Waterproof IPX7, dustproof | Quick charge option HIGHLIGHTS Anti-clipping function Quick charging Digital Sound Processing High performance DuraFit fabric USB cable doubles as a strap 100-hr standby time (BT7900 only) Durable build – shockproof, dustproof and waterproof Battery indicator to easily view power level Intuitive charging Built-in microphone for handsfree phone calls Strong Bluetooth connection up to 30m or 100ft Auto-pairing
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