The metal detector adopts automatic adjustment, the state of the art microprocessor control design does not require any form of adjustment.High Sensitivity for improved detection of small targets. Features: 1. 【AUTOMATIC ADJUSTMENT】The metal detector adopts automatic adjustment, the state of the art microprocessor control design does not require any form of adjustment.High Sensitivity for improved detection of small targets. 2. 【FULL WATER RESISTANCE DESIGN】 The unique seal design allows it to rain, soil to be used, or underwater depth of 100 feet.The pulse vibration at the tip of the frequency probe increases with the pulse approaching the target. 3. 【HIGH PERFORMANCE】Automatically turn off when the tip is up or after the last detection, and turn on and off in 1 minutes.The built-in low battery sensor reminds you that when the battery power is low, you need to replace it. Specification: Condition: 100% Brand New 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 Detector 1 * 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.