Logicmark Emergency Alert System, 1-Count: The system is VoIP compatible and works on regular home telephone lines so there's no need for you to sign up for a separate service. Simply set it up in a few minutes and you're ready to use this portable alert system any time thereafter. Help is just second away with the world's smallest two-way voice emergency pendant communicator. This product is ideal for seniors living alone or for caregivers to keep on hand for contacting family members.