1、Detection Range: The AC voltage range is 12‑1000V, 80‑1000V. When the battery voltage is below 2.6V, indicator flashes, and automatically shuts down with a beep. 2、LED Flashlight: The circuit test pen has LED flashlight at the end, white light lighting, with high brightness, which can handle complex environments. 3、Neutral Live Wire Test: The detector pen supports sound and light alarm, live wire alarm quickly display red light, neutral wire alarm slowly display green light. 4、Partition Wall Detection: Switch to high sensitivity for wall partition detection, insulation operation to ensure safe line inspection, and clear line distribution at a glance. 5、Portable Design: The circuit tester has a user friendly pen clip design, comfortable to hold, powered by a battery (not included), easy to use anytime, anywhere. 6、Other Functions: When there is no operation within 5 minutes and no voltage signal is detected, it will automatically shut down, with ambient temperature range of 0‑70℃.