The BST900W features a four-digit LED display and four control buttons:
Save state (remembers if the output was ON or OFF after power loss). bst900w manual
Your input power supply may not be able to provide enough current. Check the "Input Current" limits. The BST900W features a four-digit LED display and
Adjust your V and A, then long-press SET . Choose a location (e.g., M0) and press OK . bst900w manual
To access these, hold the button while powering on the device. Toggle between n=0 (Disabled) and n=1 (Enabled) using the arrows. 5. Wiring and Safety Precautions
The output is likely OFF. Press the OK button.