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“Warning! Warning!”, an electronic device based on user self-monitoring, adds other roles to monitor each other in groups with friends or family members, making putting down phones a competition and a game. Each group member's daily use time is displayed on the device. The team can set a time. Half an hour before it, others can issue a warning. Exceed this time, others can directly disable non-basic applications. In addition, there will be daily, weekly and monthly leaderboard series to record the number of actions of each member, as the basis for the game punishment. The worst performer is punished to invite a meal or something else.