Unwanted Target Elimination: you can set the detector not to respond to some objects.Unique Tone for Target: an unique tone corresponding to a target sounds when the object is being detected.No Clumsy Slack Cable: hidden search coil cable avoids entangling and makes easy adjustment of stem length.Headphone Jack: provided for headphone connection. Both stereo or mono headphone can be used.Volume Control: adjust the output volume of the loud speaker or headphone.Batteries Condition Indicator: shows the conditions of the batteries and low battery indication.Waterproof Search Coil: you can use the metal detector in the shallow water.Specifications:Material: ABS plastic + aluminumMin Detection Diameter: Min. 20cm / 8" (test coin: US 50)Detect Objects: Metal(iron nail, iron covering, aluminum ring, small aluminum product, coins, gold, bronze, silver)Detection Mode: Ground Balance/ RecognitionOperating Frequency: 7.5KHz+/-1KHzAudio Frequency: 200Hz(Iron), 700Hz(Gold), 1200Hz(Silver)Operating Current: Standby 40mA (LCD with backlit color 80mA), Max. 110mA (LCD with backlit color 150mA)Operating Voltage Range: 7.2-9.6VDetection Indication: LCD analogue display mode, audio modeControl: Power switchAdjustable Height of Detector: 106-120cm / 41.73-47.24inchSensitivity: 4 levels adjustableDetection Depth: 4 levels adjustableVolume: 4 levels adjustableApplication: Testing metal foreign body of r-aw materials, fuel and food, Detection of underground pipeline & line Archaeology Exploration, Found buried treasures of gold, silver and metal artifacts, The acquisition of scrap metal industry, Customs and safety inspection, Police department detective search, Detection of interpol search, Checking metal foreign bodies in express delivery and luggage.Operating Temperature: -15-45 / 5-113Storage Temperature: -20-60 / -4-140Power Supply: 6 * 1.5V AA alkalin