How do I turn the Xstream on and off?

To turn the headset ON, press and hold the On/Off button (A14) — an audio signal confirms it is switched on and the LED flashes blue. To turn it OFF, press and hold the On/Off button for 4 seconds — an audio signal confirms the headset is switched off. (Page 5)

From the official Hellberg Xstream Wireless Headset manual, page 5

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