Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to connect a bluetooth headset [title] Power on your bluetooth headset. [step] Unlike the usual wired ones, bluetooth headsets have their own power supply with a power button. Most bluetooth headsets have led indicators that light up when it's being charged or switched on.

Ending1: [title] Press and hold the power button until the case displays on-screen notifications. [step] The volume and power buttons are labeled 0-12 volts, respectively. Ending2: [substeps] For some headsets, you may need to press the power button long enough to enable the bluetooth feature (which the led indicator will tell you). [title] Turn on the bluetooth feature of the device you want to connect the headset to. Ending3: [substeps] You'll also see a number of green or yellow buttons located on the front of the headset, which you press with your thumbs to access the bluetooth dashboard. [title] Slide your bluetooth headset into the " bluetooth " radio box. Ending4: [title] Power on your bluetooth headset. [step] Navigate to settings at the bottom left corner of the screen.

Answer format: ending1/ending2/ending3/ending4