The next generation VoltAlert AC non-contact voltage testers are easy to use - just touch the tip to a terminal strip, outlet, or supply cord. When the tip glows red and the unit beeps, you know there is voltage present. Please note that the UK version detects voltage from 200v to 1000v AC Electricians, Maintenance, Service, Safety Personnel, and Homeowners can quickly test for energized circuits in the workplace or at home. Specifications Operating Principles Senses the steady state electrostatic eld produced by AC voltage through insulation without requiring contact to the bare conductor. A red glow at the tip and a beeping noise (if not switched OFF) indicates the presence of voltage. Voltage sensing ranges 200 AC to 1000 V AC Detector tip style Flat-tip Light source One high intensity red LED Agency Approvals Safety IEC 61010-1: Pollution Degree 2, IEC 61010-2-030: CAT IV 1000 V EMC IEC 61326-1: Portable IP Rating IP 40 Operating Temperature -10C to 50C (-14F to 122F) Operating Humidity Ranges 0% to 95% (0C to 30C) 0% to 75% (30C to 40C) 0% to 45% (40 to 55C) Operating Altitude 3000 m Cleaning Clean with damp cloth Batteries 2 AAA alkaline batteries included Battery Life Typical battery life of greater than 1 year Warranty Period No Note: Product does not respond to random electrostatic discharge.