This set includes two parts:#1. An on/off switch with phone cords coming out of each side#2. An adapter to add it to your existing phone cordJust connect it to your phone cord, then flip the switch to turn your phone on or off during naps, meals, etc.Works with landline and cordless phones.Works with fax machines and all-in-ones.Please Note: This switch will control 2 lines that reach the same phone or fax. To control 2 phones or faxes, you will need 2 switches.