Highly Accurate Non-Contact Voltage Detection：This non-contact voltage tester pen ensures fast, precise, and reliable voltage detection in a wide range of electrical applications, including wires, outlets, circuit breakers, and switches. It detects AC voltage levels from 90V to 1000V, making it an essential tool for both professionals and DIY enthusiasts. Advanced Safety Features for Peace of Mind：Featuring a CAT IV 1000V safety rating, this voltage tester offers the highest level of protection. The non-contact design reduces the risk of electrical shock, while the built-in self-check function ensures the tester is always in optimal working condition, providing you with added safety during every use. Clear Visual & Audible Alerts：The tester features both a bright LED red light and an audible buzzer, alerting you when voltage is detected. You can easily turn off the sound by holding the button for 3 seconds, offering versatility in various work environments where noise may be a concern. Stay informed instantly and work safely. Portable, Lightweight & Compact Design：Designed for maximum portability, this voltage detector pen is lightweight, slim, and fits easily in your toolbox, pocket, or glove compartment. Its ergonomic design allows for effortless use in tight or hard-to-reach spaces, making it the perfect tool for on-the-go electrical diagnostics. Wide Application for Home & Professional Use：This versatile voltage tester pen is ideal for a variety of electrical tasks—whether you're testing outlets, checking wires, or inspecting circuit breakers. It’s perfect for electricians, homeowners, and anyone involved in electrical troubleshooting, providing quick and accurate voltage readings without the need for direct contact. safety is a top priority, and this tool is equipped with a CAT IV 1000V rating, protecting you from electrical shock. With the added benefit of self-checking functionality, you can rest assured that the tester is always working at its best. The bright LED light and loud buzzer provide immediate alerts when voltage is present, helping you stay informed and safe. Plus, if you prefer a quieter work environment, you can disable the sound by holding the button for 3 seconds.