Detects wood, metal pipe and AC live wire. Battery included 9v. Depth of detection for wooden studs 19mm. Depth of detection for metal studs 50mm. Depth of detection for copper pipes 25mm. Depth of detection for AC wire 50mm. Visual and audio alerts. Size (H)7, (W)27.5, (D)15.7cm. Weight 0.120kg. Manufacturer's 2 year guarantee.