Voltage test pen. A compact voltage meter with acoustic and optical (bright red LED) indication when voltage is present in the circuit / cable. AC voltage range: 5 to 1000 V, Frequency range: 50 to 400 Hz, Electrical insulation: Cat. IV, 1000 V, Power: 2 pieces 1.5V Type: AAA or equivalent. Dimension (H x W x D): 152 x 32 x 28 mm. Features: Acoustic and optical confirmation: LED lighting for reliable indication in high noise environments Ergonomic design, Bright flashlight, Battery status indicator, Grip limit for increased safety. Includes lighting function. Can also be used as a flashlight Adjustable detection sensitivity.