Best Buy said on Wednesday it would buy health services provider GreatCall Inc for $800 million in cash, adding a clutch of products tailored for aging consumers.

The No. 1 U.S. consumer electronics retailer currently sells health and wellness-related products and has been shoring up on health-related assets focused on the aging U.S. population.

Privately-held GreatCall focuses on personal emergency response services for senior citizens and has over 900,000 paying subscribers, Best Buy said.