Specification:Description:This adapter comes in and out of a headset socket for use in a call center, training new people or listening in. Both earphones can adjust the volume of the loudspeaker, so they can close the sound, or they can use one of the interfaces alone, so that the original earphone can adjust the volume and close the sound.Features:1. One in two out, used for the call center, training new people or monitoring. Designed to be used as atraining adaptor. Allows for supervisor training and call pick up.2. The two headphones can adjust the volume of the speakers separately. Supplied with double jack and mute switch.3. You can use one of these interfaces alone to allow the original earphone to adjust the volume and close the sound. Can plug either into handset port or headset port.4. Compact and stylish design. Accommodates all major telephone headsets. Easy to set up, plug and play.5. Easy to use, a must have for busy call centres. Great use for call center / telephone marketing trainings.Specifications:Type: Adapter BoxMaterial: ABSLine Length: Approx. 23cm / 9 inchesAdapter Box Size: Approx. 5.5 * 4.5 *2.3 cm / 2.2 * 1.8 * 0.9 inchWeight: 30gPackage Include:1 x Interconnecting Device1 x English Manual