Asus J3455T-IM-A Manual page 22

9. Speaker header (4-pin SPEAKER)
The 4-pin header is for the chassis-mounted system warning speaker. The
speaker allows you to hear system beeps and warnings.
Connector type
Chapter 2: Motherboard information
HEADER 1x4p, 2.54mm pitch, S/T
SPEAKER
SPKO
GND
GND
+5V_SPKO
PIN 1
2-15