Item Type: Metal Detector Product Model: MD3028 Product Material: ABS Working Frequency: 6.60.2KHz Power Supply: 2 x 6F22 9V alkaline batteries (battery not included) Headphone Jack: 3.5mm Adjustable Length: Approx. 108-1340mm / 4.3-52.8in Adjustable Sensitivity: Approx. 180mm / 7.1in Adjustable Sensitivity: 8 levels adjustable sensitivity Detection Object: Metal (including iron, aluminum, coins, gold, copper, silver) Adjustable DISC Discrimination Range: 7 different metal indications. (Optional to exclude 7 metals) Detection Method: Identification, fixed point Backlight: Yes Application: Mainly used to detect and identify buried metal objects, widely used in security inspection exploration of underground pipes and cables archaeology, prospecting discovery of buried gold and silver treasures and metal cultural relics1LCD DISPLAY: This metal detector features an intuitive LCD display screen that shows depth (up to 8in), operating mode, sensitivity level and battery. 2WITH BACKLIGHT: The underground metal finder has backlight function, convenient to use even in dark places, without worrying about blurring the data. 3ADJUSTABLE DESIGN: Supports 8 level adjustable sensitivity, 7 different metal indications, you can distinguish 7 target categories and eliminate unwanted metals. 4SWEEP IDENTIFICATION: Different types of metals are distinguished by ultra slow sweep frequency search coil, and equipped with armrest for easy operation. 5AUDIO PROMPT: Metal detector has unique bass, mid and treble to distinguish different metals, with 3.5mm audio jack for easy connection of headphones. 1 x Metal Detector Host 1 x Armrest 1 x Search Coil 1 x Connecting Rod 1 x User Manual