High Quality Material: The ear amplifier is made of high-quality ABS material, offering high strength, wear resistance, and long-lasting durability. High Sensibility: This listening device features high sensitivity and delivers clear sound output. An included earphone helps enhance o quality. Complete Functionality: Designed with a charging port, earphone jack, and an upward-mounted switch knob. Its user-friendly design makes it practical and convenient to use. Easy Operation: The sound amplifier is portable and can be used in various indoor or enclosed environments. It comes with a built-in lithium battery for easy operation and convenient carrying. Application: Suitable for use in pipeline leak detection, floor heating inspection, and water body exploration. Item Type: Listening Device Material: ABS Battery: 3.7V 150mAh lithium battery (built-in) Charging: 5V USB Package Includes: 1 x Listening Device 1 x Earphone 1 x USB Cable Customer satisfaction is our priority. If you encounter any issues upon receiving the product, such as damage or incorrect items, please promptly. We are committed to providing effective after-sale support.