•Strong penetrabilty,highly sensitive metal detector<br> •The machine is based on the original HY929<br> •Using new components and the most advanced technology,the penetration enhancing times,sound quality greatly improved<br> Specification:<br> •Rated current: 10mA<br> •Power supply: 3.7V<br> •Probe sensitivity: -70Ddb<br> •Time required to fully charge: about 5 hours<br> •Penetrating medium: cement,steel pipe,rock,wooden board<br> •Listening method: headphones (16Ω speakers can be connected externally)<br> •Recording: external 3.5mm audio cable is required for recording<br> •Audio magnification: 20000 times,with recording module<br> Package included:<br> •1 x Sound Amplifier<br> •1 x English and Chinese User Manual<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin