It's a bluetooth 4.0 anti-lost accessory. If you double press SmartKee, your phone will ring, vice verse. You can keep password in key.There are more and more new websites emerging around the world. So if you want to log in different websites every day, the questions come often. "How can i remember those accounts and passwords? "SmartKee is a revolutionary device that allows you to keep track of your Key. It will prevent you from leaving your key behind, so you will not have to awkwardly stand at the door searching for your key. In addition, SmartKee comes with a free App for your phone, which records the time and place when you lost it. If you misplace your key, you could make SmartKee ring by using the App to figure out the location of your Key. If you misplace your phone, you could make phone ring by double clicking SmartKee button to figure out the location of your phone.You could save all of your passwords into SmartKee device safely and easily. At the same time, SmartKee App keeps corresponding accounts independently, unlike other App which keeps all of your accounts and passwords. There are two disadvantages comparing with SmartKee:1/ If you lose your phone, you would lose all of your accounts and passwords at the same time. Although they are encrypted, anyone could hack them by any means.2/ If you want to back up your passwords, you will have to sync your password to the cloud. It is likely that other people would get your password by any means.Continued use of GPS running in the background can dramatically decrease battery life.You could double click SmartKee to make phone ring, so you can locate your phone.When SmartKee is disconnected with your phone , your phone will ring.So SmartKee app need play music background.