Ltpgtit not only protects you and your family against the exposure to carbon monoxide it gives you more confidence and less inconvenience with some of these amazing features ltpgt ltpgtltul classquotbulletlistquotgt ltligtthe lcd display shows you a parts per millon ppm reading battery life and 24hour clockltligt ltligtincludes voice prompts and an alarm if carbon monoxide levels get too high and also a low battery voice promptltligt ltligtit uses