Want to stay calm when a relative with Alzheimer out for a walk? Tweri is a mobility solution, which offers peace of mind to caregivers and freedom to the patient himself, in the early stages of the disease. The application, designed in collaboration with AFAL (Association of Relatives of Alzheimer's) - Getafe (Madrid - Spain), is a solution for families and caregivers of Alzheimer patients who want to improve the autonomy of these people, keeping quiet during the walks that can and should occur in the early stages of the disease. Once downloaded the application may establish safe limits for the rides that the person can give, based on a maximum time you can be out and / or a maximum distance radius. When the patient goes for a ride, you only need to activate the application. At the time when safety limits are exceeded are issued automatically alerts the caregiver or the person who has established, via email stating this fact, coupled with the latest geographical position obtained by the device. In addition, the patient can alert at any time by pressing a button that has a geographic situation of loss, even without having abandoned the established boundaries. The proposed solution has the ability to alert the caregiver even when the phone runs out of data or GPS connection, or your battery is exhausted. This can be done with the server software, which provides mechanisms to alert the caregiver when certain time has passed since the patient has moved off and has not sent notice of its position. Continued use of GPS running in the background can dramatically decrease battery life.