Features USB RECHARGEABLE: Electromagnetic field radiation detector support USB charging for longer usage time. come with small size, easy to carry MULTI METHOD ALARMS: Radiation assessment, sound and light alarms when radiation exceeds the standard, stable and reliable 3 MEASUREMENTS AT SAME TIME: Three measurements of electric field, magnetic field and radio frequency, and display at the same time STABLE AND EASY TO OPERATE: Adopt excellent software algorithm, bring stable reading. Come with color display, easy to operate MEASURE HIGH AND LOW FREQUENCY: Imported high speed operational amplifier, simultaneous measurement of high and low frequency electric and magnetic fields Specification: Item Type: Electromagnetic Field Radiation Detector Material: ABS Electric Field Magnetic Field High Frequency or Power Density Range0-2000V/m0-100uT0-1000uw/cm2 Resolution0.01V/m0.01uT0.01uw/cm2 Exceeded yellow alarm40V/m0.4uT40uw/cm2 Exceeded red alarm400V/m20uT200uw/cm2 Frequency measurement range6HZ-5GHZBattery Built in 3.7v 400mAh lithium battery Charging Voltage: 5V; Charging Current: Greater than or equal to 1AGreen Light On: Charging; Green Light Turns Off: Fully chargedDisplay1.8in color TFT display, 4 level brightness adjustment Package List: 1 x Host 1 x USB Cable 1 x User Manual Note: Do not randomly knock to cause irreversible damage. Package List 1 x Host 1 x USB Cable 1 x User Manual