We are closely monitoring the Coronavirus/Covid-19 situation to understand and address any potential impacts to our employees, clients, partners and vendors.

To provide services to our mutual clients, we are taking precautionary measures (in accordance with CDC recommendations) to keep our critical life-saving operations running.

If you have any questions, you can send communications to or call 833-546-7440. Thank you for your continued partnership.

CST has been acquired by Best Buy

CST is excited to have been acquired by Best Buy. Last fall, Best Buy purchased GreatCall in support of its purpose to enrich lives through technology by addressing key human needs, including health and wellness for older adults. As the organizations diligently work to combine the human touch services and quality products, CST business operations will continue to run as usual. Our commitment to delivering exceptional service by always being accessible to our customers remains to be our top priority.

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Critical Signal Technologies seeks to empower older adults,
people with disabilities, and those battling chronic illness to live independently, with dignity.

CST helps enhance care, improve outcomes, and lower costs
with user-friendly devices and social worker-led 24/7 monitoring.

Core Solutions

In-Home PERS

Landline or cellular medical alert systems

Mobile PERS

GPS-enabled device that works across the United States

Senior Living Safety System

Enhanced alternative to traditional pull-cord systems

Medication Management

Medication reminders and monitored dispensing devices


Proven solution to increase engagement, satisfaction, and address social determinants of health

Social Work Services

Triage, support services, and loneliness/isolation outreach

Why CST Matters


Remain independent and keep living life on your own terms with simple and nonintrusive tech and an award-winning care team.

Providers/Care Managers

Gain insight into usable/actionable data to allow for proactive care delivery. Supplement your current efforts so you can deliver exceptional care and support 24/7.


Bend the cost curve with proven and scalable solutions. Reduce emergency department utilization, improve care transitions, and address social determinants of health.

CST partners with healthcare organizations and programs can be private labeled

Medicare Advantage Plans

Managed Care Organizations

HCBS/LTSS/LTC Waiver Programs

Post Acute Care Services

Certified Home Health


Affordable Housing

Independent Senior Living

Skilled Nursing Facilities

24/7 Care Center Monitoring Platform

  • 24/7 in-house patient monitoring and support center staffed by a highly-trained team led by masters-level licensed social workers
  • The Care Center uses a proprietary social work model, which focuses on all needs of the patient (physical, behavioral, and social determinants), creating a meaningful connection that drives higher engagement and more effective interventions
  • Through the use of proprietary care protocols that are modified for each customer and individual patient as needed, the Care Center staff is able to quickly and accurately address the needs of each individual, resulting in the best possible outcomes

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CST Makes an Impact


Net PMPY Savings Population-Wide with Medicare Members


Net PMPY Savings for Members with ICD-10 Primary Diagnosis of Mental and Behavioral Disorders


Satisfaction Rate Increase for Medicare and Dual Members Enrolled in PERSPlus


Monthly Member Touches via PERSPlus

CST’s data and results have been validated by a leading independent national research and consulting firm in the healthcare industry.
A team of two physicians (one a former health plan CMO) and a PhD with expertise in health economics analyzed CST’s Care Center member engagement activities.

Use Cases

ED Utilization

Care Transitions

Social Determinants of Health

SNF/SAR Discharges


Attracting New Senior Residents

Fall Prevention

CHF/COPD/Diabetes Management

Rural Health Access

Resident Safety

Patient/Member Satisfaction

Hospital Readmissions


PCP Follow-Up

Mental and Behavioral Disorders

Social Isolation

Dual Eligible Members

Member Retention