Measure Electromagnetic Field</br>Real-time display of measurement results</br>Compatible with Android and iOS</br>Ultra low power consumption</br>Easy to carry and convenient (NO keyring included)</br></br>Product Description</br></br>It is tiny?? beautifully designed with Aluminum body Semiconductor Sensor that connects to your Smartphone to measure?? collect and analyze Electromagnetic Field (EMF). <br>The unit is fully powered by the Device (Smartphone / Tablet)?? No battery or charger needed. <br>The Smart Geiger is fully compatible with iOS and Android 4.2 above. The application can be downloaded from the App Store / Google Play by searching "rt Checker" or "FTLAB" <br> <b>Attention!</b> <br>* Please kindly check whether your phone is Android 4.2 above or iOS. <br>* Old Model like a Galaxy GT 900?? Nexus Tablet Not be able to work because earphone spec is OMAP?? but If you use OMAP to CTIA Earphone Adapter?? you can use with Smart EM Checker. <br>Measurement may vary slightly depending on the smartphone model. <br>*Please contact the service people if it does not work or before you leave any bad comments. <br>Your kindly support is highly appreciated! <p><b>Specification</b> <br><b>Measurement:</b> Electromagnetic Field <br><b>Sensor type:</b> Semiconductor Sensor <br><b>Range:</b>1~2??000V/m <br><b>Measurement Error:</b>??30% <br><b>Frequency:</b>16Hz~100kHz<br><b>Size:</b>length 30mm <br><b>User Interface:</b> Smartphone (plug into headphone jack) <br><b>KC Certification:</b> CE?? KCC</p></br><br/>http://www.amazon.com/gp/product/B0179912P66ou