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Product parameters: Product size: 17.8*14*14CM (length x width x height) Built-in lithium battery: 2000MAH Power supply: DC5V/2A Speaker: 4Ω*3W internal magnetic speaker USB interf ace: Micro-USB Three timing modes of 15 minutes, 30 minutes, and 60 minutes For people: People with insomnia, middle-aged people with sleep disorders, teachers, students, ladies, IT workers, designers, business elites, long-term computer users, frequent business travelers, pregnant mothers who are anxious during pregnancy, babies who have difficulty sleeping, etc. Show more