Sangean U4 (V1) - Manual (Page 9)

8
GB
Power the radio
Note: No batteries are included with this radio.
Back up battery is to back up the preset stations and also clock-
functions during power outage, not for formal radio operation. It
is necessary to insert back up battery (2 x UM-3 1.5V, not supplied)
for memory back up even if you use AC power only. Without the
back up battery, time and preset station will get lost if remove AC
power cord from AC outlet or during AC power failure.
Back up battery compartment is located below the main battery
compartment. Insert 2 x AA size (UM-3) battery and ensure the
battery is inserted in accordance with the diagram shown.