Feature: The product is adopted quality plastic material, strong and durable to use. This sensor can be used to detect wall studs, metal pipes and electrical wires. It will remind you with sound signal and lighting when it detects wall studs, metal pipes and electrical wires. Designed according to the ergonomics principle, it is comfortable to use. Locates the edges of wood or metal studs up to 3/4 inch (20 mm) deep. Perfect tools for the home renovation and decoration. Specification: Material: Plastic LED Light: Green and Red Size(approx.): 14.5 * 6.2 * 2.6cm / 5.7 * 2.4 * 1.0inch Accuracy(approx.): 3mm Detection Sensitivity (depth): Up to 20mm Detection Range(approx.): 4cm Working Temperature: -2~40°C Alarm Mode: Sound & light Power supply: 6F22 type 9V battery Product size: 145x62x25mm Product weight: approximately 71g (without battery) Standard configuration: bare meter (without battery inside), battery, instruction manual, certificate of conformity (warranty card) Package Include: 1 x 3-in-1 handheld detector