Silvercrest SWE 100 B1 - Manual (Page 18)

Multi-Band Tuner SWE 100 B1
16 - English
Before Getting Started
You can power the device on either by using the supplied AA-sized
batteries or by using an optional plug-type power adapter (not supplied).
The power adapter must feature a compatible power plug and output a
voltage of 3V.
Do not use both means of power supply at the same
time. Remove batteries when the device is to be operated
using the power adapter.