Introduction
Thank you for purchasing the WIITHINK WTB-777 Portable Cassette Player and Recorder. This versatile device combines the classic charm of a cassette player and recorder with modern features such as Bluetooth connectivity, USB playback, and AM/FM radio. Designed for ease of use and portability, it allows you to enjoy your favorite audio content wherever you go. Please read this manual thoroughly before operating the device to ensure proper use and to maximize its lifespan.

Figure 1: WIITHINK WTB-777 Portable Cassette Player and Recorder
Product Overview
The WIITHINK WTB-777 is an all-in-one audio solution, offering multiple playback and recording options. Its compact design and dual power capabilities make it ideal for both home and portable use.
- Classical Tape Radio Player: Enjoy music, radio, and cassette tapes with this all-in-one portable player featuring AM/FM radio, Bluetooth connectivity, USB port, and recording from radio to cassette.
- Retro Nostalgia: Relive the nostalgia of cassette tapes while enjoying modern features like Bluetooth. Built-in cassette player and recorder to record radio to blank tapes.
- AM/FM Radio Stereo: Equipped with a long antenna and upgraded chip for great reception of AM/FM stations. Features a big speaker for clear stereo sound. Frequency range: FM 87 - 108 MHz, AM 520 - 1710 kHz.
- Bluetooth Streaming: Stream your favorite music wirelessly from your smartphone, tablet, or other Bluetooth-enabled devices.
- Portable Design: Compact and lightweight for easy portability, perfect for on-the-go listening or use at home. Includes an earphone jack and DC/AC power options.

Figure 2: Key Features of the WTB-777
What's in the Box
Upon unpacking, please ensure all items listed below are present and in good condition:
- WTB-777 Cassette Player Boombox
- Power Cord
- User Manual (this document)
Setup
Powering the Device
The WIITHINK WTB-777 can be powered by either AC power or batteries.
- AC Power: Connect the included power cord to the AC input jack on the back of the unit and plug the other end into a standard wall outlet (AC 120V/60Hz).
- Battery Power: For portable use, open the battery compartment on the bottom of the unit and insert 4 x 'C' size batteries (not included), ensuring correct polarity (+/-). Close the battery compartment securely.
Note: When using AC power, batteries are automatically disconnected. Remove batteries if the unit will not be used for an extended period to prevent leakage.
Operating Instructions
Familiarize yourself with the control panel before operation. Refer to Figure 3 for a detailed diagram of the controls.

Figure 3: Control Panel Diagram
- 1, 2, 3: Mode/Playback Control Buttons (USB/Bluetooth Play/Pause, Previous, Next)
- 4: Volume Knob
- 5: Function Switch (Cassette/USB/Bluetooth/FM/AM/Off)
- 6: Built-in Microphone
- 7: Radio Antenna
- 8: Portable Handle
- 9: Pause (Cassette)
- 10: Stop/Open (Cassette)
- 11: Fast Forward (Cassette)
- 12: Fast Rewind (Cassette)
- 13: Play (Cassette)
- 14: Record (Cassette)
- 15: Tuning Knob
- 16: USB Port
- 17: 3.5mm Jack (Earphone/Aux-in)
Cassette Player Operation
- Set the Function Switch (5) to "TAPE".
- Press the Stop/Open button (10) to open the cassette compartment door.
- Insert a cassette tape with the open edge facing upwards. Close the compartment door firmly.
- Press the Play button (13) to begin playback.
- Adjust the Volume Knob (4) to your desired listening level.
- To pause playback, press the Pause button (9). Press again to resume.
- To fast forward, press the Fast Forward button (11). To fast rewind, press the Fast Rewind button (12). Press Play (13) or Stop/Open (10) to stop winding.
- To stop playback and eject the tape, press the Stop/Open button (10).

Figure 4: Inserting a Cassette Tape
AM/FM Radio Operation
- Set the Function Switch (5) to "FM" or "AM".
- Extend the telescopic antenna (7) for optimal FM reception. For AM reception, rotate the unit for best signal.
- Rotate the Tuning Knob (15) to select your desired radio station.
- Adjust the Volume Knob (4) to your desired listening level.

Figure 5: Enjoying AM/FM Radio
Bluetooth Streaming
- Set the Function Switch (5) to "BT" (Bluetooth). The unit will enter pairing mode, indicated by an audible prompt.
- On your Bluetooth-enabled device (e.g., smartphone, tablet), enable Bluetooth and search for available devices.
- Select "WTB-777" from the list of devices to pair. Once paired, you will hear a confirmation sound.
- Begin playing audio on your connected device. The sound will be streamed wirelessly to the WTB-777.
- Use the Volume Knob (4) on the unit or the volume controls on your connected device to adjust the volume.
- Use buttons (1, 2, 3) to control playback (Play/Pause, Previous/Next track) directly from the unit.

Figure 6: Bluetooth Connectivity
USB Playback
- Set the Function Switch (5) to "USB".
- Insert a USB flash drive containing MP3 audio files into the USB Port (16).
- The unit will automatically begin playing the audio files from the USB drive.
- Use buttons (1, 2, 3) to control playback (Play/Pause, Previous/Next track).
- Adjust the Volume Knob (4) to your desired listening level.

Figure 7: USB Playback and Earphone Jack
Recording to Cassette
The WTB-777 allows you to record audio from the radio onto a blank cassette tape.
- Insert a blank cassette tape into the cassette compartment (refer to Cassette Player Operation).
- Set the Function Switch (5) to "FM" or "AM" and tune to your desired radio station.
- Press the Record button (14) and the Play button (13) simultaneously to begin recording. The unit will automatically start recording the radio broadcast onto the tape.
- To stop recording, press the Stop/Open button (10).
Note: The built-in microphone (6) can also be used for voice recording directly to tape when the function switch is set to "TAPE" and the Record button (14) is pressed.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Do not use abrasive cleaners or solvents. For the cassette head and pinch roller, use a specialized cassette head cleaner periodically to ensure optimal sound quality and prevent tape damage.
- Storage: When not in use for extended periods, store the unit in a cool, dry place away from direct sunlight and extreme temperatures. Remove batteries if storing for a long time.
- Tape Care: Store cassette tapes in their cases to protect them from dust and damage. Avoid exposing tapes to strong magnetic fields.
Troubleshooting
If you experience issues with your WIITHINK WTB-777, please consult the following table before seeking professional service.
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not power on. |
|
|
| No sound from speaker. |
|
|
| Cassette tape does not play or sounds distorted. |
|
|
| Poor radio reception. |
|
|
| Bluetooth device won't pair. |
|
|
Specifications
Detailed technical specifications for the WIITHINK WTB-777.
| Brand | WIITHINK |
| Model | WTB-777 |
| Product Dimensions (L x W x H) | 9.8 x 3 x 5.1 inches (24.9 x 7.6 x 13 cm) |
| Item Weight | 2.75 pounds (1.25 kg) |
| Color | White |
| Connectivity Technology | Bluetooth, Built-in Microphone, Earphone Jack, USB |
| Speaker Type | Portable |
| AM Frequency Range | 520 - 1710 kHz |
| FM Frequency Range | 87 - 108 MHz |
| Power Source | AC (Power Cord included), 4 x 'C' Batteries (not included) |

Figure 8: Product Dimensions
Warranty and Support
Specific warranty information for the WIITHINK WTB-777 is typically provided with the product packaging or on the manufacturer's official website. Please refer to the documentation included with your purchase for detailed warranty terms and conditions.
For technical support, troubleshooting assistance beyond this manual, or inquiries regarding parts and service, please contact WIITHINK customer support through their official channels. Contact information can usually be found on the product packaging, the manufacturer's website, or the retailer's product page.




