Feature: 1. Easy to Read: Colored LED lights make readings visible and clear in day or dark. 2. Portable: The radiation tester is easy to carry around as it fits in your pocket or bag. 3. LED Light: Lighting 5 LED indicators, respectively representing different radiation values, easy to use. 4. High Performance: The LED magnetic field test bench is reliable, robust, effective and ultra sensitive. 5. Safe: Measures levels to prevent potentially harmful long term overexposure to EMF, keeping you safe from radiation and good for your health. Specification: Item Type: EMF Detector Material: ABS Accuracy: 5% Product Size: Approx.14 x 5 x 3cm / 5.5 x 2 x 1.2in Detection Range: 0 To 20+milliGauss Detection Frequency: 50/60 Hz (50 to1000Hz-ELF) (1000 to 20000Hz-VLF) Battery: 1 x 9V 6F22 Battery 800mAh (Shipped With Built In Battery) Weight: Approx.120g / 4.2oz. Package List: 1 x EMF Detector1 x User Manual