HY929 Enhance Sound Amplifier Leak Detector Listen System Through Wall [Recording Version] - EU PlugStrong penetrabilty, highly sensitive metal detectorThe machine is based on the original HY929Using new components and the most advanced technology, the penetration enhancing times, sound quality greatly improvedSpecification:Rated current: 10mAPower supply: 3.7VProbe sensitivity: -70DdbTime required to fully charge: about 5 hoursPenetrating medium: cement, steel pipe, rock, wooden boardListening method: headphones (16 speakers can be connected externally)Recording: external 3.5mm audio cable is required for recordingAudio magnification: 20000 times, with recording modulePackage included:1 x Sound Amplifier1 x English and Chinese User Manual