Feature 1USB RECHARGEABLE: Electromagnetic field radiation detector support USB charging for longer usage time. come with small size, easy to carry 2MULTI METHOD ALARMS: Radiation assessment, sound and light alarms when radiation exceeds the standard, stable and reliable 33 MEASUREMENTS AT SAME TIME: Three measurements of electric field, magnetic field and radio frequency, and display at the same time 4STABLE AND EASY TO OPERATE: Adopt excellent software algorithm, bring stable reading. Come with color display, easy to operate 5MEASURE HIGH AND LOW FREQUENCY: Imported high speed operational amplifier, simultaneous measurement of high and low frequency electric and magnetic fieldsItem 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 Package List: 1 x Host1 x USB Cable1 x User ManualNoteDo not randomly knock to cause irreversible damage.