VLF means Quite Small Frequency and is the same technologies Utilized in detectors built for cash, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from three kHz to 70 kHz. Here are 5 explanations why you might decide on a VLF more than a PI Next, https://www.rueanmaihom.net/forum/topic/68212/metal-detector-batteries:-how-to-keep-going-longer