Micro Voltmeter Dial marked in 5 Volt increments Simple 2-wire connection to AC hot and neutral Meter senses and powers from same connection Backlit meter face WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Owner&';s Manual (pdf)