Best wishes on the surgery! After spending around the last 25 years or so responding to 911 calls I'll throw in my $.02 on devices like yours. They are very helpful if you don't have access to a cell phone or are unable to speak. I especially like yours since it connects directly to 911 rather than a 3rd party operator like Life Alert and similar devices. But I will add that you can dial 911 just as quickly and easily on any smart phone as a pendant device. For users of devices that have 3rd party operators, know that the best course of action is to always dial 911 direct if you can. This will get you the quickest, most appropriate response to your emergency.