The Louroe Electronics HD-10 8-Station Headphone Junction Box is equipped with 1/4" inputs. This box accommodates up to 8 headphones. Included in is a volume control for each input and 2 expansion connectors for adding 1 or 2 more HD-8 units. This unit also provides a 1/4" (3.3mm) plug and 1/8" (3.5mm) plug for connecting into the headphone jack of the Louroe audio base station. All headphones connected to this unit should be of the same type and impedance to ensure uniform output volume to all headphones.