Review on 💡 Premium Non-Contact Voltage Tester: LED Flashlight, Buzzer Alarm | AC Voltage Detector Pen - Dual Range 12V-1000V | Live/Null Wire Judgment by Joshua Coulter

Uses AAA batteries for longer life (not included). 3 levels of sensitivity with 5-level bar graph and more intense beeps. Penlight is bright enough. Auto shut off works. looks strong Warning: Sensitivity is set to minimum at power on and no beep will be heard when powered on 120V AC. You must remember to press the "S" key to display 120VAC. Level 3 is so sensitive it will start beeping 2 inches from the wire and even on wires behind drywall. When you press the "S" button, you will hear two or three beeps indicating the sensitivity setting. Allowing the default sensitivity not to recognize 120VAC makes it a bit dangerous!