WIDE APPLICATION:This voltage detector can measure the same phase or different phase of any wire in the line. It can be used to distinguish between alternating current and direct current, and to determine the positive and negative electrodes of alternating current. PRODUCT FEATURES:With high and low voltage indicator, NCV sensor, responsive and very practical. With white LED lighting, energy saving and environmental protection, easy to use. MULTItoFUNCTION:This electric voltage tester has builttoin buzzer alarm, the alarm sound is loud, prompting you to pay attention to safety hazards. It is made of high quality ABS material, it is durable and has a long service life. PRODUCT SPECIFICATION:This test pencil supports a wide range of measurements with a measurement range of 12to1000V. Operating temperature: 0to40 . Storage temperature: 10to50 . Alarm mode: sound and light alarm. TIPS:This package contains 1 test pencil. Please note: external batteries are not included in the package.