Features: 1. Wide range of applications, can detect hidden in the wall, metal, wood corrugated, live wires 2. With 4 modes, STUD, DEEP, METAL, AC four mode selection 3. Buzzer alarm when approaching foreign objects during detection 4. Power saving and durable, using 9V battery, with automatic shutdown function, power saving and durable, when the battery power is almost used up, the battery icon on the LCD screen will flash
