An important addition to the hameco family, and useful accessory for office and call center headsets. When developing this product, we had those users who wanted to use their headset with a landline phone, PC, and laptop in mind. Connect your headset to the RJ9 extension cable, and your landline or PC to the HS-21 cable. To allow you to connect to your PC we have provided a 2x3.5 cm jack ended extension cord, which needs to be connected to your PC sound card’s microphone and speaker output. Using the switch on top of the device, you can choose which device you would like to speak from, or just listen to music (through you PC or laptop). The HS-21 must be connected to a telephone receiver.