Description High impedance sound recording for crystal clear audio from telephone lines. RJ11 phone connector design allows simple connection to any telephone RJ11 port via phone cable. No need to worry about in or out port direction—the recorder automatically detects the signal. Low charging requirement. Built-in special circuit draws power from the phone system. First-time use requires initial charging. For heavy call volumes, recharge weekly via USB charger; for normal use, recharge monthly via USB charger. Plug-and-play operation: Connect the telephone line to the RJ11 port and turn the power switch on to begin recording. Suitable for use in offices, hotels, or homes with straightforward setup. Automatically starts recording when a call is made. Loop recording supported. When the memory is full, the device overwrites the oldest recorded files in a first-in-first-out manner. Specifications: Memory: 32GB micro-SD card (not included) Recording Time: Up to 7–30 days depending on usage Recording Format: WAV Date and Time Stamp: Yes Battery: 700mAh lithium battery Compatibility: Works with Windows 7/8/10, macOS Recording Bitrate: 192Kbps USB Port: USB 2.0 Frequency Response: 20Hz – 20kHz Working 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 1 x USB Cable Note: Light reflection and display differences may cause slight color variation between the product image and actual item. Measurement may vary by +/- 1–3cm.