: 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 . We are committed to providing reliable after-sale support.