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