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What's this Letsfit white noise sleep machine can be brought to you? 1) Help your baby have a restful sleep. 2) Create a peaceful environment, comfortable sleep helper, white noise background. 3) Cover up unwanted noise, enjoy your private space. SPECIFICATIONS Adapter Input: 110-240V-50/60Hz Adapter Output: 5V—1.0A Device Working Voltage: DC 5V Device Working Power: Note: The white noise machine does not have a built-in battery, a power adapter include for using. Package Contents: 1 × Sleeping Sound Machine 1 × Power Adapter 1 × User Manual Letsfit White Noise Sound Machine for Sleeping & Relaxation.