Look for a small "FCC ID" or "IC" number on the back sticker of the device. Type that number into Google—it will lead you to the exact OEM PDF manual for your specific brand.
Regular maintenance and prompt troubleshooting are essential to extending the lifespan of the TDV26. The instruction manual provides guidance on: tdv26 instruction manual
If your model supports Bluetooth, switch to "BLUE" mode and pair it with your device (often appears as "TD-V26" or similar). Line-in (Aux): Look for a small "FCC ID" or "IC"