12 volt black case single hole fixing two terminal.& nbsp; For use with low pressure warning switches or lights indicators<span id=”sceditor-end-marker” class=”sceditor-selection sceditor-ignore” style=”line-height: 0; display: none;”> </span><span id=”sceditor-start-marker” class=”sceditor-selection sceditor-ignore” style=”line-height: 0; display: none;”> </span>& nbsp;& nbsp; Loud and urgent tone 90dB at 20cm.<br>