1. Voice call recording: This recording box can be used to record voice content during phone calls. Whether for office or home use, it helps you record important phone conversations and messages 2. USB interface: This device uses a USB interface to facilitate connection with computers or other portable devices. You can connect the recording box to your computer via USB for data transfer and file management 3. 32k recording quality: The recording box supports 32k recording quality, providing clear audio output. With high-quality recording, you can hear exactly the details and conversations on the phone 4. Mini design: This recording box has a mini design, making it easy to carry and use. Its compact size makes it suitable for placement on a desk or home environment, taking up less space 5. Record analog phone calls: This device can be used to record analog phone calls, allowing you to conveniently record important information and conversations on analog phone calls.