Input Voltage Options: 110~120V, Frequency Range: 300KHz-700KHz, Multifunctional: This power line noise analyzer is multifunctional, measuring interference and thus noise on the power supply network and comparing filtered and unfiltered systems. LCD Display: This power supply noise analyser is very easy to use with an LCD display that clearly shows the detected noise to help you keep track of the situation. Easy To Use: This noise analyser is very simple to use to compare unfiltered and filtered systems, you just plug the tester into an unfiltered system, set the sensitivity to 100 and then plug the tester into a filtered system to see the difference in noise. LED Indicator: This power supply noise tester has an LED indicator which operates over a frequency range of 300kHz to 700kHz, below or above these values the LED light up to indicate that the value is out of range. Small Speakers: This AC power noise tester has small speakers to amplify the noise output directly and determine by sound to determine the size and frequency of the noise. The higher the noise level, the higher the sound level. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.