... Pocket-size design, easy to take along 1. Non-contact voltage detector for cables, power, circuit breakers, lighting fixtures, switches, outlets ... is working, and bring brightness3. When voltage is detected, bright red LED will shine with buzzer4. Digital controlled ON/OFF power button5 ... 1.5V battery or IEC LR03 or NEDA 24A battery Voltage Detector VD03 ,shine with buzzer,