1Target Alienation: the pulse vibration at the tip of the frequency probe increases with the pulse approaching the target. 2Automatic adjustment: the state of the art microprocessor control design does not require any form of adjustment. 3Slanted Turn On/ Off: no button switch. Automatically turn off when the tip is up or after the last detection, and turn on and off in 1 minutes. 4Waterproofing: the unique seal design allows it to rain, soil to be used, or underwater depth of 100 feet. 5Low battery indicator: the built-in low battery sensor reminds you that when the battery power is low, you need to replace it. Features: 1. Target Alienation: the pulse vibration at the tip of the frequency probe increases with the pulse approaching the target. 2. Automatic adjustment: the state of the art microprocessor control design does not require any form of adjustment. 3. Slanted Turn On/ Off: no button switch. Automatically turn off when the tip is up or after the last detection, and turn on and off in 1 minutes. 4. Waterproofing: the unique seal design allows it to rain, soil to be used, or underwater depth of 100 feet. 5. Low battery indicator: the built-in low battery sensor reminds you that when the battery power is low, you need to replace it. 6. The battery is easy to install: the bracket 9V battery quickly intervened and changed without tools. After rotating the knob, pull out the compression seal and enter the battery compartment. 7. Belt and wrist strap: including belt loops attached to any common belt clamp and wrist strap to increase safety. 8. Application: public security inspection, search diving, professional archaeology, decoration, see the true chapter line. Specification: Condition: 100% Model: MD740 Work Power: 9V (6F22) Battery (not included) Alarm Mode: Pulse Induction Vibration Measurement Range: Underwater 30m Detection Of Metal Size: 1 Yuan Coins Weight: Approx. 415g / 14.6oz Size: Approx. 385 * 50 * 50mm / 15.2 * 2.0 * 2.0in Package List: 1 *Metal Detector1 *Hanging Rope Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.