This Electric Voltage Detector Sensor Tester Pen is a convenient and practical tool for testing power cables, circuit breakers, and wall sockets. With a non-contact and pen-shaped design, it is easy to operate and carry around. The LED flashlight allows for use in dark environments, while the auto shut-down feature activates if not detected within 5 minutes. Constructed with ABS and PC materials in blue or yellow colors, this tester pencil is a must-have for both home and professional use. Battery-powered and insulated for safety, it is the ideal solution for electrical testing needs.