Welcome to our store! 1. High-Quality Material: This sound amplifier is made of high-quality ABS material, which is very durable and wear-resistant. 2. High Sensitivity: The sound listening device features high sensitivity, ensuring clear sound. You can also use headphones to enhance sound quality. 3. Complete Functionality: The device is equipped with a charging hole, headphone hole, and an upward switch button. It boasts a user-friendly design that is practical and convenient. 4. Simple Operation: This sound amplifier can be used anywhere, including indoors or in buildings. It has a built-in lithium battery and is easy to use and carry around. 5. Application: This headphone audio device can be used for detecting side leakage in pipelines, detecting underfloor heating, and exploring water bodies. Item Type: Sound Listening Eavesdropping Device Material: ABS Battery: 3.7V lithium battery 150mAh (built-in) USB Charging: 5V Package Includes: - 1 x Sound Listening Eavesdropping Device - 1 x Headphones - 1 x USB Cable 100% Satisfaction: Our customers are our top priority. If you encounter any product issues after receiving the item, such as damage and incorrect quantity of goods, please contact the seller immediately. We do our best to provide you with satisfactory after-sales service.