The Freedom Alert has the ability to be programmed with up to four (4) contacts to call anytime. The system can be customized with the three position switch on the back of the base unit to select one of three modes. A power outlet and an active landline are all that is needed for the unit to operate. The medical pendant is powered by a lithium-ion battery that lasts up to 6 months on a single charge. If the programmed contacts are unreachable – the system can default to call an emergency 911 operator.