Specifications: Battery power: 6F22 9V battery (not included) Stud detecting depth: Wood 30 x 30 mm: less than or equal to 18 mm Metal detecting depth: iron pipe Φ25mm: less than or equal to 30 mm AC live wires: AC 90-250V live wire (5 cm), frequency at 50-60 Hz Operating temperature/humidity: -7 Celsius-40 Celsius, less than 75 percent Storage temperature/humidity: -20 Celsius-50 Celsius, less than 85 percent Size: 155 x 72 x 28 mm (L x W x H) Color:Black,Yellow(option) Key Features: 1. This unit is 3 in 1 metal/voltage/stud detector. 2. It uses electronic signals to locate the exact position of studs. 3. Ceilling joist AC wires and metal through drywall, concrete and other common wall materials. 4. Once the edge of a stud has been detected, it emits audio and visual (LCD display) that allow you to easily find out its center position. 5. This unit is an ideal tool for professional electrician and user in decoration field. Function: 1. Detect stud 2. Detect metal 3. Detect AC live wires 4. Using metal detect function to find hidden metal pipe, rivet or fixture in the wall 5. Auto power off (no operation 30 seconds) Notes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 2. Please allow slight dimension difference due to different manual measurement. Thank you for your understanding. Parts List: 1 x Metal detector 1.This unit is 3 in 1 metal/voltage/stud detector. 2.It uses electronic signals to locate the exact position of studs. 3.Ceilling joist AC wires and metal through drywall, concrete and other common wall materials. 4.Once the edge of a stud has been detected, it emits audio and visual (LCD display) that allow you to easily find out its center position. 5.This unit is an ideal tool for professional electrician and user in decoration field.