The MD-S1 is a high performance handheld metal detector designed to meet the exact requirements of the security industry. It is mainly used in airport, prison, gymnasium and recreation ground and anywhere that may have hidden metal needed to be detected. It can be used in searching hidden weapons and sword that will harm people's security and checking hang-luggage and package for metal objects. CE, RoHS approved. Features: 1. Dual Indicators: 2. Highly Sensitivity: 3. External Sensitivity Adjuster, convenient. 4. Rechargeable battery socket: 5. Beep/vibration switch