We redefined “Metal Detector” in AKYOR. Why not using the processor, memory, analog/digital system of our smart phones to build a cost-effective, compact, light-weight but powerful metal detector? CSP86 families of metal detectors are powered through the headphone jack of your phone, no need for an external battery. It differentiates between various kinds of metals. It is pre-programmed for precise detection of Gold and Silver. CSP86, with 20cm diameter coil, is the most compact professional metal detector in the world. This instrument is the most cost-effective version of our product. It is an advanced ULF/VLF simultaneous multi-frequency metal detector with auto-ground balancing, discrimination and GPS.