1 、可以避免出门忘带钥匙；
2、帮助记忆力不好的人提供方便；
3、父母提醒孩子的工具；
4、可移植性号；(First, through the voice prompt, can effectively avoid going out to forget the key, the door forgot to pull the key situation. You don't have to waste time with their families from far away and ran home to send you the key; then don't waste money please unlock the company for you to unlock; then do not worry at night when the keys are inserted in the door, the house was stolen. Second, through this device can help people with poor memory to avoid the problem of easy to forget, and make up for the shortcomings of your forgotten. Third, it is a good tool for parents to remind their children. Before parents go out, they record what they want to say to their children. When the children want to go out to play, they play the role of parents! Fourth, it also has an important function, that is, good portability, can be installed on any device that can be opened and closed, such as doors, refrigerators, doors and so on.)