BXT Non-Contact Electrical Test Pen Probe AC Power Outlet Voltage Alert Detector Sensor Tester AC90-1000V Brand BXT,100% quality guaranteedTest Voltage Range: AC 90-1000V AC Safety Rating : CAT II 1000v Ideal design for testing power cables, circuit breakers, wall sockets, junction boxes, fuses, etc As long as the non-contact test pen detected voltage, the LED light in the white tip will light on, \"Beep\" sound and red flashing LED would indicate the presence of voltage Totally insulated, no exposed metal or conductive parts