The portable high-performance handheld metal detector can detect various types of metal objects such as coins, gold, silver, relics, and jewelry. Detection Sensitivity: US 25-cent coin from 60 mm, iron pipe (Ф20 mm) from 120 mm; Battery Required: 9V EASY OPERATION: One-button operation; it would beep and the LED light would flash when the device approaches a metal object Perfect for security, safety, indoor/outdoor events - Check boxes and parcels, letters for metal objects. Treasure hunting tool, carpenter, etc. Foldable design for easy carrying and storage, light weight and comfortable handle for easy operation