Operation information and tips: The operation is completely automatic. All metals will be tested, including ferrous and non-ferrous metals.When a is detected, the TC-110 will generate an audio and/or vibration alarm. As the precise pointer gets closer, the rate of pulse audio and vibration will increase proportionallyBecause the TC-110 is a static, non-motion detector, it can achieve optimal operation when the unit is turned off between uses.Avoid using TC-110 as an excavation or detection tool. It is designed to and accurately position the tip of a flat surface. It is not intended to use excessive force.When using water, the depth must not 10 feet (3 ). Make that there is no sand, sediment, etc. on the battery cover threads. The o-ring is regularly lubricated with silicone oil to maintain a tight seal. To remove dry dirt, or other debris, simply wash it by hand with soap, water and a soft cloth. Do not use any abrasives or chemical cleaners that may scratch or erode the surface.4 major features of the upgrade:1: Protective shell2: IP68 waterproof, up to 3 underwater3: Manually balance4: Detection distance 6-7cmProduct parameters:Model: TC100Working temperature: -35F (-37C) to 158F (70C)Operating frequency: 11.5 kHzWaterproof rating: the maximum depth is 10 feet (3 )IP68 tuning: automatic or manual tuning: Proportional audio/vibration pulse rateControl: power supply, right position, adjustment switchSize: Length: 9 inch (23cm)Thickness: 1. 6 inch (4.1 cm)Battery: Single 9V battery (not included)color:Yellowmaterial: plasticProduct precautions:Low battery alarm:When the battery is low, the detector will send out an alternate two-tone alarm. Replace the 9V battery as as possible.Battery replacement:Just turn the battery cover counterclockwise and tighten it clockwise. To install the 9V battery correctly, match the larger battery terminal with the larger opening in the compartment. When storing for more than 30 , remove the battery.Package Contents:1 x Metal DetectorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.