Features 
<br />1. Rotatable Battery Cover, easy to replace the battery.
<br />2.Automatically distinguish the Zero Line and Fire line.
<br />3.Sound and LED alarm
<br />4.Automatic selection of 3 kinds of sensitivity.( High,Medium,low)
<br />5.Voltage sensitivity is from 12V to 1000V AC.
<br />6.Auto power off.
<br />7.Small and compact pen, design for easy carrying.
<br />
<br />Specifications 
<br />Voltage Sensitivity: 12V to 1000V AC
<br />Frequency: 50-60Hz
<br />Alarm Mode: Sound and light
<br />Flash Light: White
<br />Auto Power Off: Yes
<br />Operating Temperature: 32 to 122F (0 to 50 degree)
<br />Storage Temperature: -4 to 140F (-20 to 60 degree)
<br />Humidity: < 85%RH
<br />Battery: 2 * 1.5V AAA Batteries (batteries are included)
<br />Item dimensions: 16 * 2 * 2cm
<br />Item weight: 50g
<br />Package size: 16.5 * 4 * 4cm
<br />Package weight: 65g
<br />
<br />Package Included 
<br />1*Intelligent AC Voltage Detector
<br />1*User Manual
<br />2*AAA Batteries