The 4G LTE GPS Help Button (starting at $24.95 per month) is Bay Alarm Medical's latest portable medical alert product. Like its predecessor, the Mobile GPS Help Button, it's a waterproof device that will put you in touch with a live emergency response agent with the touch of a button. It lasts up to four days between charges and offers a useful caregiver tracking app, but you'll get faster response times and urgent care features with our Editors' Choice, the Great Call Lively Mobile Plus.