1、3 in 1 multi‑scanner stud detector for wood, metal, and AC wires. Helps you quickly & easily locate wood, metal studs, joists, metal pipes, rebar & live AC wire behind wall, floor, ceiling. 2、Features a large LCD display & sound warning to help detect the accurate location of the objects. Saves you lots of time by displaying the desired stud center & the precise position of the stud. 3、Easy to use, after the battery is installed(not included), there will be a long beep when it is turned on. When it is automatically turned off, press the test button for 2 seconds to turn it on again. 4、It is lightweight, long‑lasting and convenient to use in your home, office, workshop. Makes all of your DIY home projects easier such as mounting your TV, bathroom cabinet, photo frame, garage racks etc. 5、The compact design is easy to carry and use. When the battery power is too low, it will prompt. The ergonomic design means you can hold the wall scanner in your hand comfortably. 1 x 3in 1 Detector(Battery Not Included)1 x Instruction Manual Item Type: 3in 1 DetectorMaterial: ABSColor: As shown in the pictureProduct Size: Approx. 15.5x7x 3.4cm / 6.1x 2.8x 1.3in Weight: Approx.185g/ 6.5ozBattery: 1 x 9V, 6F22 battery(Not included)There are 3 detector modes:Stud Scan Mode: Position the edges of metal and wooden studs on a normal wall up to 1.5 inches (38 mm)Metal Scanning mode: locate metals, such as iron, copper and aluminum pipes, up to 2.36 inches (60 mm);AC Wire Scan Mode: Position the AC wire within 2 inches (51 mm)Working Temperature: 0℃-40℃Function: 1. All detection functions have automatic correction function 2. All detection functions have AC warning function 3. Measure wooden stems gear with edge display 4. With low voltage displayApplication: Used to detect the center position of the wooden stem, the metal position and the live wire in the wall of wooden boards and gypsum board materialsHow to Use: 1. Insert the battery.(Not included) 2. Testing and calibration:(1) After the battery is installed, the unit turns on and emits a long beep. After the automatic shutdown, press the test button for two seconds to restart.(2) Press the select button to select stud, AC live wire or metal detection function. (For detailed pictures, please refer to the manual)(3) Place the bottom of the detector close to the wall. At this time, the function symbol does not flash. Touch the measurement button on the right to sample on the surface to be measured. After sampling, the function symbol flashes.(4) After sampling, release the test button and move the device slowly along the wall.(5) When the center bar is displayed on the LCD, it means that you have found the edge of the stud. Stop the movement and marks this point on the edge grooves. At this time, please touch the test button to eliminate the beeping noise when marking the position.(6) Repeat the sampling step of (3) above, and then measure along the wall, from the opposite direction to the center, find the other side edge of the grooves, and locate the other side edge of the groove.(7) In order to lock the position more accurately, the above sampling and detection steps can be repeated multiple times.