The essentials... energy-saving tools. 

 - Singapore:  JSIM Publications,  May 2022. 
 - 16-17 pages. 
 - BBC Earth.  No. 6.  Update: the latest intelligence.  Vol. 14. .
<br/><br/><label>ISSN: </label>2737-5560 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Technology.
<br/><br/><label>Dewey Class. No.: </label>BBC Earth Es745 May 2022