The headphone features an induction hook for the left ear that you can simply hang over your ear. To ensure that the hook remains comfortable to wear even after extended periods, it has been ergonomically shaped and is only 1 mm thick, making the hands-free device very comfortable. The CL Hook 5 headphone is equipped with a 2.5 mm jack, allowing you to connect it to any mobile phone or telephone. The sound is transmitted directly to your hearing aid via induction.