Features: Lightweight and portable, with built-in high-accuracy chip,practical and reliable to use. Sound&Light Alarm: When the detected data beyond the safety value, it will emit sound and light to alarm you.Data lock function, one-button lock radiation value for you to read the detected data more convenient. Portable Size: The small size of this tool very convenient for everyday use, you can hold it in one-hand to use easily. The LCD display screen has the backlight for you to open or close according to your need, and it also show you the graphics display radiation trend. Specifications: Material:ABS Unit:V-m Accuracy:1V-m Range:1~1999V-m Alarm threshold:40V-m Reading display:3-1/2digit LCD Measurement bandwidth:5Hz~3500MHz Operation temperature:0~50 Power:3.7V lithium battery Size:Approx.6.1x2.5x13.4cm/2.4''x0.98''x5.28'' Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x EMF Meter