1. Product Overview
The TRANSFORMERS TF-T39 Bumblebee Wireless Earphones offer a unique blend of iconic design and advanced audio technology. Featuring Bluetooth 5.4, 13mm titanium diaphragm drivers, and intelligent noise reduction for calls, these earphones are designed for an immersive listening experience and clear communication.
Figure 1: TRANSFORMERS TF-T39 Bumblebee Wireless Earphones (Black/Yellow)
Figure 2: TRANSFORMERS TF-T39 Optimus Primal Wireless Earphones (Silver/Black)
Package Contents:
- 2 x Bluetooth Earphones (Left and Right)
- 1 x Charging Case
- 1 x Charging Cable (Type-C)
- 1 x User Manual
- 3 sizes of ear caps (S, M, L)
Figure 3: Bumblebee TF-T39 Product Packaging and Included Accessories
Figure 4: Optimus Primal TF-T39 Product Packaging and Included Accessories
2. Setup
2.1 Charging the Earphones and Case
Before first use, fully charge the earphones and the charging case.
- Connect the provided Type-C charging cable to the charging port on the case.
- Connect the other end of the cable to a USB power source (e.g., wall adapter, computer USB port).
- The indicator light on the charging case will show charging status. Once fully charged, the light will indicate completion (refer to LED indicator section for details).
- Place the earphones into the charging case. They will begin charging automatically.
Figure 5: Charging the TF-T39 Earphones and Case via Type-C
2.2 Bluetooth Pairing
- Power On: Open the charging case. The earphones will automatically power on and enter pairing mode.
- Activate Bluetooth: On your device (smartphone, tablet, etc.), enable Bluetooth.
- Search for Device: Look for "TRANSFORMERS TF-T39" in the list of available Bluetooth devices.
- Connect: Select "TRANSFORMERS TF-T39" to pair. Once connected, you will hear an audio prompt, and the earphone indicator lights will change (refer to LED indicator section).
- Quick Reconnection: After initial pairing, the earphones will automatically reconnect to the last paired device when taken out of the case, provided Bluetooth is enabled on the device.
Figure 6: Automatic Quick Reconnection Feature
2.3 Wearing the Earphones
Choose the ear tips that provide the best seal and comfort for your ears. Gently insert the earphones into your ear canal and twist slightly to secure them. A proper fit ensures optimal sound quality and noise isolation.
Figure 7: Ergonomic In-Ear Design for Comfortable Wear
3. Operating Instructions
The TF-T39 earphones feature intelligent touch controls on each earbud.
Figure 8: Intelligent Touch Control Functions
3.1 Basic Controls
- Power On: Long press the touch key for 3 seconds (or simply open the charging case).
- Power Off: Long press the touch key for 3 seconds (or place back into the charging case).
- Play/Pause: Single click the left or right headset touch key.
- Next Track: Double-click the right headset touch key.
- Previous Track: Double-click the left headset touch key.
3.2 Volume Control
- Volume Up: Click the right headset touch key. There is a tone at the maximum volume.
- Volume Down: Click the left headset touch key.
3.3 Call Management
- Answer/End Call: Double-click the left or right headset touch key.
- Reject Call: Long press the left or right earphone touch key for 2 seconds.
Figure 9: Smart HD Call Functionality
3.4 Mode Switching
The TF-T39 supports dual-mode switching between music and gaming modes.
- Switch to Game Mode: Long press the right earphone touch key for 2 seconds.
- Switch to Music Mode: Long press the right earphone touch key for 2 seconds again.
Figure 10: Core Functions including Dual-Mode Switching
3.5 Voice Assistant
- Activate Voice Assistant (Siri): Long press the left earphone touch key for 2 seconds.
4. Maintenance
4.1 Cleaning
- Regularly clean the earphones and charging case with a soft, dry, lint-free cloth.
- Remove ear tips and clean them with mild soap and water, then dry thoroughly before reattaching.
- Do not use harsh chemicals or abrasive materials.
4.2 Storage
- When not in use, always store the earphones in their charging case to protect them and keep them charged.
- Store in a cool, dry place away from extreme temperatures and direct sunlight.
4.3 Battery Care
- To prolong battery life, avoid fully discharging the earphones and charging case frequently.
- Charge the device regularly, even if not in use for extended periods.
5. Troubleshooting
- Earphones not pairing: Ensure both earphones are in the charging case, then open the lid to activate pairing mode. Make sure Bluetooth is enabled on your device and try searching again. If issues persist, try resetting the earphones (refer to manufacturer's website for specific reset instructions if not in manual).
- No sound from one earphone: Place both earphones back into the charging case, close the lid, then open it again. Check your device's audio settings to ensure balance is centered.
- Charging issues: Ensure the Type-C cable is securely connected to both the charging case and the power source. Try a different charging cable or power adapter. Clean the charging contacts on both the earphones and the case.
- Poor sound quality/intermittent connection: Ensure your device is within the 10m Bluetooth transmission range. Avoid obstacles between your device and the earphones. Ensure earphones are fully charged.
6. Specifications
Figure 11: Detailed Product Parameters
| Feature | Specification |
|---|---|
| Product Model | TF-T39 |
| Brand Name | TRANSFORMERS |
| Bluetooth Version | V5.4 |
| Bluetooth Transmission Distance | ≥ 10m (Max 10m-20m) |
| Music Time (Earbuds) | About 5 hours |
| Total Usage Time (with Case) | Up to 24 hours |
| Charging Time | About 1.5 hours |
| Driver Diameter (Horn Size) | 13mm titanium diaphragm |
| Charging Interface | Type-C |
| Rated Input | 5V === 30mA |
| Headphone Battery Capacity | 35mAh |
| Charging Case Battery Capacity | 320mAh |
| Weight | 38g |
| Max Output | 10mW |
| Frequency Response Range | 20 - 20000Hz |
| Impedance Range | Up to 32 Ω |
| Total Harmonic Distortion | 1% |
| Waterproof | No |
| Material | Plastic |
| Features | With microphone, Apple Siri Support, Playback Control, Sound Isolating |
7. User Tips
- Optimize Sound: Experiment with the different ear tip sizes to find the best fit for your ears. A good seal significantly improves bass response and passive noise isolation.
- Seamless Switching: Utilize the dual-mode smart switching to quickly transition between immersive music listening and low-latency gaming, enhancing your experience for each activity.
- Clear Calls: Position the earphones correctly to benefit from the intelligent noise reduction algorithm during calls, ensuring your voice is heard clearly.
- Battery Management: For optimal convenience, get into the habit of placing the earphones back into their charging case when not in use. This keeps them protected and ready for your next session.
8. Warranty and Support
For warranty information, technical support, or any product-related inquiries, please contact the seller or refer to the official TRANSFORMERS product website. Keep your purchase receipt as proof of purchase for warranty claims.
