Theft of things from bags or bags is a rather unpleasant incident. It is proposed to prevent an attempt to theft by the Serenity device, which looks like a keychain. The device is equipped with buttons for entering the code and attached to the “dog” of lightning or on a specific pocket. If someone outsider tries to open the bag, Serenity will scare away the attacker with a sound signal of 100 dB. Sirena will work until the movement of the bag will stop. If desired, the owner can add another 6 mobile devices to the number of users, which will allow, for example, family members fearlessly open the bag. If the owner has forgotten things and moved away from them at a certain distance, Serenity will send a push notification with the corresponding reminder. To open the bag, the user will need to enter the password in the application on the smartphone or unlock manually. Currently, the Serenity device is available for preliminary order on Kickstarter for $ 79.