Does the Sfpw 360 B1 need batteries or a power adapter to work?
The device can be operated with either three AAA batteries or the included power adapter. However, the power adapter must be connected for permanent projection, permanent display illumination, and use of the USB charging port. For basic timekeeping functions, batteries alone are sufficient. (Page 10)
From the official Silvercrest Sfpw 360 B1 manual, page 10
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