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Discontinued comcast home security services and now have a camera, motion detector, keypad and door sensors that I was told were mine and did not need returned. Are there any other ways to use/companies that use this equipment?
No other companies use that equipment, you could try ebay/craigslist if you want to recoup your money.
Aprilgmb, you can return any necessary equipment to your nearest XFINITY service center or UPS store.