Description 1. High impedance sound recording, delivers clear audio from telephone line. 2. RJ11 phone connector design, easily connects to telephone RJ11 port via phone cable; no need to worry about input or output port direction, the recorder automatically detects the signal. 3. Low charging frequency: powered by the phone system through built-in circuitry. First-time use requires charging. For heavy call usage, recharge weekly via USB charger; for normal usage, recharge monthly via USB charger. 4. Plug-and-play: connect the telephone line to the RJ11 port and turn the power switch on to begin recording. Can be used in office, hotel, or home with simple setup. Automatically starts recording when a call is made. 5. Loop recording: supports continuous recording; when memory is full, the device overwrites the oldest files in first-in-first-out mode. Memory: 32GB micro-SD card Recording Time: 7 to 30 days depending on usage Recording Format: WAV Date and Time Stamp: Yes Battery: 700mAh lithium battery Compatibility: Windows 7/8/10, macOS Recording Bitrate: 192Kbps USB Port: USB 2.0 Frequency Response: 20Hz - 20kHz Operating Temperature: 0°C - 40°C Dimensions: 59mm x 36mm x 25mm Color: White Material: Plastic Package Contents: 1 x RJ11 Telephone Recorder 1 x Telephone Line Cable 1 x USB Cable Only the items listed are included; other accessories are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual product. Measurement error allowed is +/- 1-3cm.