UNI-T UT12B AC Voltage Detector Pen - Red + Black (2 x AA)
Model: UNI-T UT12B - Indicators: LED and Beep - Voltage range: AC 90V~1000V - Frequency range: 50Hz~60Hz - Measurement Category: CAT IV 1000V - Powered by 2 x AA battery (included) - Comes with Chinese/English user manual