Kensington H3000 Bluetooth Over-Ear Headset - Manual (Page 4)

4. The power button, Bluetooth pairing / voice assistance button, and USB-C charging port are located on the lower edge of the earcup with the earcup controls.
To turn your headset on, slide the power button to the right. A blue light will illiuminate. Slide the power button to the left to turn the headset off.
To pair a device, press and hold the Bluetooth pairing / voice assistance button down for 5 seconds.
To enable voice assistance commands, press the Bluetooth pairing / voice assistance button two times.