It has two detecting plate, the big one can detect 3.5m under ground at most,and about 1.5m for the small one.

 Technical Specifications

power Supply:   8pcs 1.5V Batteries in Series Emitting Frequency:  6.99KHz Signal Frequency: 437KHz indicators: Visual: Lever Meter Indicators : Sound:2"Speaker or Earphone

(Earphone not included)

Function: Disc: Ground Balance Controls Function: Distinguish Ferrous and Non-Ferrous Metal Controls: Disc Control; Ground Balance Control Controls: Tune Control; Sensitivity control Controls: Discrimination Control Controls: Zeroing Control Operating Current: 300mA MAX at MAX Volume The Detecting Depth (Max): 1.5--3.5 Meters Sensitivity: 35cm for a US(25cent)quarter with meter Sensitivity : Indication at min, discrimination Export Packing: 4PCS /Carton 0.1736CBM Export Packing : (84*31*17cm) Attachment : battery box and battery bag

Under Ground searching metal detector