EM2 Multi-Purpose Broadband EMF RF Electrosmog Meter, ELF out to Analog 18GHz * Frequency response: 50-HZ to 18-GHZ - reduced sensitivity above 10-GHZ declining to ~50% at 18-GHZ * Sensitivity range: 0.005uW/cm2 to 40mW/cm2 * Accuracy: +/- 10% 50-HZ to 10-GHZ * Battery life: 9V Duracell, approx 50 hours * Electrical field component of EMF detected, not magnetic