VLF stands for Quite Small Frequency and is the same technology used in detectors created for cash, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from 3 kHz to 70 kHz. Here's 5 reasons why you could possibly decide on a VLF over a PI Now https://worldschoolface.com/index.php/forum/thread/2264/essential-gear-for-metal-detector-adventures/