Keep from the object to be measured, turn on the knob switch and adjust it slowly, so that it is just in the state of no sound and no light, and detect metal<br> When the detector's metal detection head (METAL) is moved parallel to the surface of the object to be measured, if the voltage loop is detected, the detector voltage<br> The detection part (VOLTAGE) moves parallel to the surface of the object to be measured. When the detector is close to a metal object or a voltage circuit, it will flash<br> Light and sound. When there is no metal object or voltage circuit nearby, it will not flash and sound. When the test is over, please cut off the power.<br> The detector cannot test the AC voltage in metal pipes, metal walls or deep parts.<br> Power supply: 6F22 type 9V battery (battery not included)<br> Product size: 150x78x24mm<br> Standard configuration: bare watch (no battery inside), English manual<br> Product advantages: suitable for use in interior decoration structures, it can detect the position of metal and wires in the wall, when metal and voltage are sensed, the instrument will flash and sound<br> Product technical features:<br> Voltage test: wire above AC 100V, depth 30mm<br> Colour:black<br> Material:plastic<br> Package Contents:<br> 1 * metal detector(Without battery)<br> 1 * English manual<br> Only the above package content, other products are not included.<br> Note: Light 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.<br>Note: <br>1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. <br>2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you!<br>About Shipping: <br>1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly.<br>2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.<br>3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 392 hours, wish you a happy shopping!