Features High sensitivity and strong penetration, significantly improving sound quality. Compatible with display spectrum, recording devices, transmitters, wireless equipment, and can be connected to a two-channel wire for direct recording. Compact and lightweight design for easy portability. Simple operation: place against doors, windows, or walls, then adjust the sound using the knob until clear audio is heard. Capable of detecting sound through wooden or brick walls, windows, and doors. Effectively filters noise and enables faster sound detection. Specifications: Captures subtle sounds through walls, ideal for detecting damaged pipes or locating leaks. Color: Black Current Consumption: 12mAh Probe Sensitivity: -60dB Working Time: 5-7 hours Battery: 3.7V, 100mAh Product Dimensions: 37 x 34 x 27mm (1.5 x 1.3 x 1.1 inches) Product Weight: 25g (0.9 ounce) Package Dimensions: 93 x 80 x 37mm (3.7 x 3.1 x 1.5 inches) Package Weight: 73g (2.6 ounces) Packing List: 1 x Voice Listening Detector 1 x Earphone 1 x USB Cable 1 x User Manual