Electromagnetic Field Radiation Detector Handheld USB Rechargeable EMF Meter Tester Item Type: Electromagnetic Field Radiation Detector Material: ABS Specification Electric Field Magnetic Field High Frequency or Power Density Range 0-2000V/m 0-100uT 0-1000uw/cm2 Resolution 0.01V/m 0.01uT 0.01uw/cm2 Exceeded yellow alarm 40V/m 0.4uT 40uw/cm2 Exceeded red alarm 400V/m 20uT 200uw/cm2 Frequency measurement range 6HZ-5GHZ Battery Built in 3.7v 400mAh polymer lithium battery Charge Charging Voltage: 5V; Charging Current: Greater than or equal to 1A Green Light On: Charging; Green Light Turns Off: Fully charged Display 1.8in color TFT display, 4 level brightness adjustment