Unverified85% confidenceDecision RuleTime unknown
定时关机功能必须选带'渐弱淡出'（fade-out）的机型：硬性到点静音会因声音的突然消失把浅睡者惊醒，理想的淡出时长应≥30秒；仅有'定时'而无淡出功能的产品在助眠场景是明显缺陷
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