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KAIWEETS HT100 Non Contact Voltage Tester AC Electricity Detect Pen 12V-1000V/48V-1000V instant the best gift for peopleSAFETY FIRST: It will send out multiple alarms through sound and light. When the voltage is detected, the tip will send out red light and beep. When the higher the sensed voltage is, or the closer it is to the voltage source, it beeps at a higher frequency. At the same time, the screen will be red or green, red means high voltage and live wire are detected, green means low voltage and null wire are detected. Key Features NON CONTACT: With NCV