Features: 1. High sensitivity and strong penetration, significantly improving sound quality. 2. Compatible with display spectrum devices, recording pens, transmitters, and wireless equipment; can be directly connected to a two-channel wire for recording. 3. Compact and lightweight design for easy portability. 4. Simple operation: attach to doors, windows, or walls, and adjust the sound using the knob until clear o is heard. 5. Capable of detecting sound through wooden or brick walls, windows, and doors. 6. Effectively filters background noise and enables faster sound detection. Specifications: - Color: Black - Consumption current: 12mAh - Probe sensitivity: -60dB - Working time: 5–7 hours - Battery: 3.7V, 100mAh - Item size: 37 x 34 x 27mm (1.5 x 1.3 x 1.1 inches) - Item weight: 25g (0.9 ounce) - Package size: 93 x 80 x 37mm (3.7 x 3.1 x 1.5 inches) - Package weight: 73g (2.6 ounces) Package Contents: 1 x Voice Listening Detector 1 x Earphone 1 x USB Cable 1 x User Manual