Description: The product is adopted quality plastic shell 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. Perfect tools for the home renovate and decorate. Features: The product is adopted quality plastic shell 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. Specifications: Condition: New Model: TS78B Material: Plastic Accuracy: 3mm Detection Sensitivity (depth): Up to 20mm LED Light: Green and red Power Supply: 9V 6F22 battery (not included) Detection Range: 4cm Working Temperature: -2~40°C Alarm Mode: Sound & light Size: Approx. 14.5 * 6.2 * 2.6cm / 5.7 * 2.4 * 1.0inch Weight: Approx. 96g Quantity: 1PC Package Includes: 1 x 3-in-1 handheld detector(battery is not included) Please Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.