Alternate your headset between PC and phone with the push of a button. Receive stays open on both sides at all times enabling you to hear computer prompts. Features include microphone mute, receive volume and handset/headset switch. Connects to PC sound card. Compatible with most phones systems (number pad must be on phone's base, not the handset). Pair with TalkPro SP1 or SP2  headsets. Two year unconditional warranty.