一個可以用來找回失蹤手機的程序，當使用者換 SIM卡時會自動發出郵件到 Gmail帳號通知手機目前的位置-A cell phone can be used to retrieve the missing procedure, when the user change SIM card will automatically send phone messages to Gmail account current location notification

倒计时处理工具（设置时间，监听时间变化，以及到点通知）-Countdown processing tools (set-up time, the listening time change, and the point notification)