This is a CAT IV non-contact voltage detector from Knightsbridge with a 90-1000V voltage detection range, clip for attachment to clothing and built-in LED torch to aid testing in difficult to reach places. Certified to EN60950-1, EN 55022, EN61000 and EN 55024 with a stand-by mode up to 1.5 years. This product requires a 2xAAA batteries which need to be purchased seperately.