Welcome to our store 1High Quality Material: Ear amplifier is made of high quality ABS material, high strength, wear resistant, sturdy and durable. 2High Sensitivity: Audio listening wiretap device has high sensitivity, clear audio, and you can use the earphone to improve audio quality. 3Complete Function: With charging hole, earphone hole and upward switch knob. Humanized design, more practical and convenient. 4Easy Operation: Sound amplifier can be used anywhere, even indoors or in buildings, and has a builtin lithium battery, easy to operate and carry. 5Application: Audio ear listening device can be used for pipeline side leakage, floor heating detection, water body exploration. Item Type: AudioListeningWiretapDevice Material: ABS Battery: 3.7V lithium battery 150mah (built-in battery) USB Charging: 5V .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1 x AudioListeningWiretapDevice1 xEarphone 1 x USB Cable (Customer Satisfaction) - is our priority. If you notice any problems with the products after receiving the goods, such as damaged goods or incorrect quantity, please contact us immediately. We will do our best to provide you with satisfactory after-sale service.