For desk phones, wireless headsets will include a base unit that allows compatibility with hundreds of different phone models. An A/C power cable will plug into an electrical outlet. A telephone interface cable will connect between your desk phone and base. The headset will use DECT or Bluetooth wireless frequencies to communicate with the base, allowing you to roam your office and be hands-free during calls. At the end of the day, you will dock your headset on the base. This allows the battery in the headset to recharge and be ready for use the following day. Additional cables or lifters may be required for remote call alerts and answer/hang-up capabilities.
For PCs and computers, a USB dongle will connect to your PC,  which uses either DECT or Bluetooth wireless frequencies. You will configure your computer settings to use the wireless headset as your microphone and speaker source. Many new computers will do this automatically and ask if you want to use this device for audio.
For cell phones and tablets, a wireless headset will need to use the Bluetooth frequency. The headset will connect by putting it into pairing mode and connecting the headset via your phone. For most cell phones, you will receive remote call alerts and be able to answer/end calls by simply pressing a button on the headset. Many headsets have sensors to know when you put the headset to auto-answer calls. Others will have voice commands to assist with call management. Cell phone wireless headsets will include a charging cable and, depending on the model, may offer different-sized earbuds and charging/travel cases.
TECH TIP: Many computers have Bluetooth connectivity, allowing a headset to connect directly without a dongle. This method is never as stable and tends to have unexplained issues. Thus, it is highly recommended to always use the dongle for the best wireless headset experience.