Denso BHT-825QW User Manual page 142

10.
Press the ENT key.
A 1-dot thick frame displays around the screen.
Press the BS/C key to return to the previous screen.
Press and hold the BS/C key, or press the SF key and BS/C key
simultaneously to return to the TEST menu.
11.
Press the ENT key.
The speaker sounds once, and the display returns to the TEST menu.
2D Code Handy Terminal
127