IP68 warterproof, It can be used when diving. Three different degree of sensitivity adjustment. Hand-held,small and ,precision tracking. The 4.2Inch serach coil helps to detect small items in a variety of hunting conditions. It with audible and static alarms to indicate the presence of metal objects. alarms increase in intensity as the equipment is moved closer to the metal target. With this metal detector, you can hunt for coins, relics, jewelry, gold, and silver anywhere, including lawns, snows, mountains and etc. Note:Battery is a sensitive and dangerous item and cannot be transported by logistics, so the battery is not included. Alarm indication:audio and vibration appear at the same time or seperately. Sensitivity:about equal 5 cm (for RMB, one yuan coin) Power supply:9 V battery (6F22ND) (Not Included ) Detection depth:5-10cm Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:Red Material:ABS Package Contents: 1 * diving metal detector(battery not included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.