1. Multi Detect Range: It can measure the electromagnetic field in both the extremely low frequency (ELF) range and the extremely low frequency (VLF) range.2. Work Frequency: Specially designed to operate in the DC range of 0‑3Hz (sub extremely low frequency itself), including the frequencies of humans and the earth itself.3. Easy : The is simple and convenient. Press the button to activate it. It needs to press and hold the button to monitor the reading.4. Detect Frequancy: The detected frequency is 50 / 60Hz (50‑1000hz‑elf) (1000‑20000hz‑vlf), and the accuracy is 5%, which is very practical.5. High Quality Material: High quality ABS material is selected, which is impact resistant, fall resistant, wear resistant, not easy to damage, and can be used for a long time.Spec:Item Type: EMF MeterMaterial: ABSProduct Length: Approx. 14.3cm / 5.6inWeight: Approx. 131g / 4.6ozBattery: 6F22 9V Lithium Battery, 800mAh (With Built In Battery Delivered)PackageList:1 x EMF Meter1 x English Manual.