1. Introduction
Welcome to the Zombies Cat B21 TWS Wireless Earbuds user manual. These earbuds combine cutting-edge Bluetooth 6.0 technology with AI translation capabilities and a smart app for a personalized audio experience. Designed for comfort and style, the B21 earbuds feature immersive spatial audio, crystal-clear calls, and a unique necklace design.
2. Package Contents
Ensure all items are present in your package:
- B21 Earbuds (x2)
- Charging Case (x1)
- Charging Cable (x1)
- Alloy Necklace (x1)
- User Guide (x1)
3. Product Overview
Familiarize yourself with the components of your B21 earbuds:
- **Voice Outlet:** Where sound is emitted.
- **Indicator Light:** Provides status feedback.
- **Touch Key:** For controlling various functions.
- **Ear Handle:** The main body of the earbud.
- **Microphone:** For calls and voice commands.
- **Charging Contact Point:** Connects to the charging case.
4. Setup
4.1 Charging the Earbuds and Case
Before first use, fully charge the earbuds and charging case.
- **Earbuds Charging:** Place the earbuds into the charging case. The earbud's red indicator light will be solid during charging and turn off when fully charged.
- **Case Charging:** Connect the charging cable to the Type-C port on the charging case and a power source. The blue indicator light on the charging case will flash during charging and turn off when fully charged.
4.2 Bluetooth Pairing
- **Power On:** Take the earbuds out of the charging case. They will automatically power on (or long-press the touch key for 3 seconds). The main earbud's indicator light will flash red and blue alternately, indicating pairing mode.
- **Activate Bluetooth:** On your device (smartphone, tablet, etc.), enable Bluetooth.
- **Select Device:** Search for "QCWS-B21" in the list of available Bluetooth devices and select it to connect.
- **Confirmation:** Once connected, the earbud indicator lights will turn off, and you will hear an audible "connected" prompt.
- **Clear Pairing Information:** If needed, when not connected to a device, tap the L/R earbud 5 times to restore initial settings and clear pairing information.
4.3 Smart APP Installation and Connection
Enhance your experience by installing the dedicated Smart APP:
- **Download APP:** Scan the QR code provided in the user guide or search for "原声 APP" (Original Sound APP) in your device's app store.
- **Install and Open:** Install the APP and open it.
- **Add Device:** In the APP, tap the "+" icon in the top right corner to add a device.
- **Select Earbuds:** Choose "QCWS-B21" from the list of Bluetooth devices to connect.
- **Customize:** Once connected, you can access features like AI translation, EQ settings, button mapping, and more.
5. Operating Instructions
The B21 earbuds feature intuitive touch controls. Operations can be customized via the Smart APP.
| Function | Action |
|---|---|
| Power On | Take earbuds out of charging case OR Long-press touch key for 3 seconds. |
| Power Off | Place earbuds into charging case OR Long-press touch key for 5 seconds. |
| Play/Pause | Double-tap either L or R earbud. |
| Volume Down | Single-tap Left (L) earbud. |
| Volume Up | Single-tap Right (R) earbud. |
| Previous Track | Triple-tap Left (L) earbud. |
| Next Track | Triple-tap Right (R) earbud. |
| Answer/End Call | Double-tap either L or R earbud. |
| Reject Call | Long-press either L or R earbud for 2 seconds. |
| Voice Assistant | Long-press Left (L) earbud for 2 seconds (not during calls). |
| Music/Game Mode | Long-press Right (R) earbud for 2 seconds. |
*Note: The operation can be customized in the App according to personal preference.
5.1 Indicator Light & Tone Guide
- **Power On:** Red and blue lights flash alternately ("power_on" tone).
- **Power Off:** Red light flashes then extinguishes ("power_off" tone).
- **TWS Pairing:** Main earbud flashes red and blue alternately; secondary earbud light extinguishes upon successful pairing ("pairing" tone).
- **Bluetooth Connected:** Indicator lights off ("connected" tone).
- **Automatic Reconnection:** Indicator lights off ("connected" tone).
- **Low Battery:** Earbud red light flashes quickly, "battery_low" tone every minute.
- **Earbud Charging:** Earbud red light solid, extinguishes when full.
- **Charging Case Charging/Low Battery:** Blue light flashes during charging, extinguishes when full. Blue light flashes quickly then extinguishes when low battery.
6. Key Features
- **Futuristic Mecha Design:** Bold sci-fi-inspired styling with a striking silhouette.
Image: Futuristic Mecha Design of the B21. - **Ergonomic Comfort Fit:** Precision-shaped for a secure, natural hold. Lightweight (4.0g per earbud) for all-day wear. Features ultra-secure fit for workouts and skin-friendly, irritation-free design.
Image: Ergonomic Comfort Fit. - **Multi-Mode AI Translation:** Equipped with 5 intelligent translation modes: free conversation, voice translation, text translation, simultaneous interpretation, and conversation translation. Communicate across languages with zero barriers.
Image: Multi-Mode AI Translation in use. - **Statement Necklace Design:** The included earphone chain transforms the charging case into a stylish accessory.
Image: Necklace Design. - **Premium 13mm Dynamic Driver:** Delivers rich, dynamic sound with natural punch and full-bodied texture for immersive, high-fidelity audio.
Image: Premium 13mm Dynamic Driver. - **Immersive Spatial Audio:** Experience true 360° surround sound with lifelike positional audio. Includes relaxing music options and customizable EQ settings via the app.
Image: Immersive Spatial Audio features. - **Crystal-Clear Calls (ENC-MIC):** High-sensitivity ENC microphones suppress ambient noise and enhance your voice for interruption-free conversations.
Image: ENC-MIC Clear Call technology. - **Latest Bluetooth 6.0:** Cutting-edge technology for faster transmission, stronger anti-interference, and stable connections. Features low latency for smooth audio-visual synchronization in gaming and video.
Image: Bluetooth 6.0 and Low Latency. - **Long-Lasting Battery Life:** 6 hours of continuous playback on a single charge, extending to 30 hours with the charging case.
Image: Long-Lasting Battery Life.
7. Specifications
| Attribute | Value |
|---|---|
| Product Model | QCWS-B21 |
| Product Name | TWS Wireless Bluetooth Earbuds |
| Brand Name | ZOMBIES CAT |
| Material | Metal, ABS, Plastic (PC+ABS+Zinc Alloy) |
| Rated Voltage | 5V |
| Rated Current | 300mA |
| Bluetooth Version | V6.0 |
| Communication | True wireless |
| Wireless Type | Bluetooth |
| Transmission Distance | About 10 Meters (10m-20m) |
| Battery Capacity (Earbud) | 30mAh |
| Battery Capacity (Charging Case) | 300mAh |
| Battery Life (Single Playback) | About 5-6 hours |
| Battery Life (Total with Case) | Up to 30 hours |
| Charging Time (Earbuds/Case) | About 1.5 hours |
| Driver Diameter | 13mm |
| Frequency Response Range | 20 - 20000Hz |
| Sensitivity | 110dB |
| Impedance Range | up to 32 Ω |
| Resistance | 32Ω |
| Max Output | 5mW |
| Number Of Drivers | 2 |
| Vocalism Principle | Dynamic |
| Earcups Type | Sealed |
| Codecs | AAC, sbc |
| Connectors | Type C |
| Waterproof | Yes |
| With Microphone | Yes |
| Volume Control | Yes |
| Control Button | Yes |
| Active Noise-Cancellation | No |
| Product Specifications | 6.7*4.2*2.4CM |
| Quality Grade | Qualified product |
| Origin | Mainland China |
8. Maintenance
- Clean the earbuds and charging case regularly with a soft, dry cloth.
- Avoid using harsh chemicals or abrasive materials.
- Keep the charging contacts clean to ensure proper charging.
- Store the earbuds in their charging case when not in use to protect them and maintain battery life.
9. Safety Information
9.1 Battery Warnings/Precautions
- Do not disassemble, impact, squeeze, or throw into fire.
- Do not place in high-temperature environments.
- If the battery is severely swollen, do not continue to use it.
- Improper battery replacement may cause an explosion risk. Only replace with the same type or equivalent type of battery.
- The battery must not be exposed to direct sunlight, fire, or similar overheating environments.
- Do not use the battery after it has been immersed in water.
- This product contains lithium batteries. Please dispose of them separately from household waste. Recycle them to reduce pollution and protect the environment.
9.2 General Safety Guidelines
- Properly control the volume and duration of headset use to prevent hearing damage.
- Do not use Bluetooth headsets in potentially dangerous environments to ensure personal safety.
- Avoid using the headset while driving, as it can distract you and cause danger.
- Keep the headset out of reach of children to prevent improper use and potential hazards.
- If you experience obvious discomfort, irritation, or other adverse reactions while using the Bluetooth headset, stop using it immediately.
- Avoid storing or using the Bluetooth headset in environments with temperatures below -10°C or above 50°C, as this will shorten the life of the headset and battery.
10. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Earbuds not powering on | Low battery; not removed from case correctly. | Charge the earbuds and case. Ensure earbuds are fully removed from the case or long-press touch key for 3 seconds. |
| Cannot pair with device | Earbuds not in pairing mode; Bluetooth off on device; already connected to another device. | Ensure earbuds are flashing red/blue. Turn device Bluetooth off/on. Forget "QCWS-B21" on other devices. Try clearing pairing information (5 taps on L/R earbud when not connected). |
| No sound or intermittent audio | Low battery; out of Bluetooth range; interference; incorrect audio output selected. | Charge earbuds. Move closer to your device. Avoid strong electromagnetic interference. Check device's audio output settings. |
| Microphone not working | Microphone blocked; incorrect input selected on device; app permissions. | Ensure microphone is clear. Check device's input settings. Grant microphone permissions to the app if applicable. |
| Touch controls unresponsive | Earbuds not properly seated; software glitch. | Adjust earbuds. Restart earbuds by placing them in the case and taking them out. Check for firmware updates via the app. |
| AI Translation not working | App not connected; internet connection issues; incorrect language settings. | Ensure earbuds are connected to the Smart APP. Check your device's internet connection. Verify language settings in the app. |
11. User Tips
- **App Customization:** Explore the Smart APP to customize EQ settings, button functions, and translation modes to suit your preferences.
- **Necklace Use:** When not using the earbuds, keep them in the charging case and wear the case with the alloy necklace for easy access and a unique style statement.
- **Firmware Updates:** Periodically check the Smart APP for firmware updates to ensure optimal performance and access to new features.
12. Additional Resources
For a comprehensive guide and further details, you can refer to the official user manual PDF: