KZ Krio In-Ear Wireless Earbuds User Manual

1. Introduction

The KZ Krio In-Ear Wireless Earbuds are designed to deliver a superior audio experience with advanced features such as LDAC Lossless Audio, 6-Mic Hybrid Active Noise Cancellation (ANC), and APTX Audio Decoding. This manual provides detailed instructions to help you get the most out of your KZ Krio earbuds.

KZ Krio In-Ear Wireless Earbuds and Charging Case. The image highlights the transparent design of the earbuds and the compact charging case.

2. Package Contents

KZ Krio In-Ear Wireless Earbuds (Left and Right)
Charging Case
USB Type-C Charging Cable
Silicone Ear Tips (L, M, S sizes)
User Manual

3. Setup and First Use

3.1 Charging the Earbuds and Case

Place the earbuds into the charging case.
Connect the charging case to a power source using the provided Type-C USB cable.
The indicator light on the charging case will show charging status. Ensure the case and earbuds are fully charged before first use.

A full charge provides approximately 8 hours of earbud playtime, and the charging case offers approximately 3 additional charges, totaling around 32 hours of battery life. A quick 10-minute charge can provide up to 2 hours of listening time.

Battery Life Information for KZ Krio Earbuds — Battery Life Information: 8 hours single battery life, 3 times consecutive charging from case, 32 hours total battery life, and 10 minutes charging for 2 hours of listening.

3.2 Pairing with a Device

Open the charging case. The earbuds will automatically enter pairing mode.
On your device (smartphone, tablet, etc.), enable Bluetooth.
Search for "KZ Krio" in the list of available Bluetooth devices and select it to connect.
Once connected, you will hear an audible confirmation.

The KZ Krio features New Generation Bluetooth 5.3 for stable and efficient wireless connection.

Bluetooth 5.3 Chip Diagram — Diagram illustrating the Bluetooth 5.3 chipset, emphasizing lower power consumption, better signal, and stable connection.

3.3 Wearing the Earbuds

Choose the correct size of silicone ear tips (L, M, S) for a comfortable and secure fit. A proper seal is crucial for optimal sound quality and noise cancellation performance.

Earbud design and ear tip sizes — Image showing the transparent aesthetic of the earbuds and the three sizes of silicone ear tips (L, M, S) for comfortable wear.

3.4 KZ Official App

Download the official KZ APP to unlock more hidden features. The app allows you to locate and search for the TWS, check battery status in real-time, switch between different sound modes, customize sound preferences, and personalize controls.

Screenshot of the KZ App interface — Screenshot of the KZ App, demonstrating options for sound modes, battery status, and personalized customization.

4. Operating Instructions

4.1 Touch Controls

The KZ Krio earbuds feature minimalist UI touch controls:

Play/Pause: Tap once on either earbud.
Last Song / Next Song: Tap the left earbud twice for the previous song, tap the right earbud twice for the next song.
Hang up/Answer Call: Tap once on either earbud during a call.
Reject Incoming Call: Long press either earbud for 2 seconds.
Activate Voice Assistant (Siri): Long press the right earbud for 2 seconds.
Switch ANC/Transparency/Standard Mode: Long press the left earbud for 2 seconds to cycle through Transparency Mode, ANC Mode, and Standard Mode.

Note: Some functions may vary by device.

Minimalist UI Control Logic Diagram — Diagram illustrating the touch control gestures for various functions on the KZ Krio earbuds.

4.2 Active Noise Cancellation (ANC)

The KZ Krio features 6-Mic Hybrid ANC technology, providing up to -55dB of deep noise cancellation. This system uses feedback, feedforward, and phone call noise cancellation microphones to effectively reduce environmental noise.

6-Mic ANC Hybrid Active Noise Cancellation Diagram — Diagram showing the placement of feedback, feedforward, and phonecall noise cancellation microphones. It also illustrates the effect of -55dB Deep Noise Cancellation with a comparison of sound waves before and after cancellation.

4.3 Noise Cancellation Modes

The earbuds offer three noise cancellation modes for flexible adaptation to different scenarios:

Transparency Mode: Ideal for daily conversations, driving, or cycling, allowing you to clearly perceive your external environment.
ANC Mode: Best for commuting or noisy environments, providing a quiet and high-quality listening experience.
Standard Mode: For general use, offering balanced sound performance.

Three Noise Cancellation Modes and their usage scenarios — Visual representation of the three noise cancellation modes (Transparency, ANC, Standard) and their recommended usage scenarios: Daily Conversation, Indoor Places, and Commuting.

4.4 Call Noise Cancellation

Equipped with a new Qualcomm high-end chipset, the Krio features CVC omnidirectional call noise cancellation. This technology effectively filters surrounding noise and wind, restoring clear human voices for efficient and focused communication.

CVC Omnidirectional Call Noise Cancellation features — Image highlighting the High-Definition Call Microphone (360° Precise Sound Pickup), CVC Call Noise Cancellation (intelligently identifies background noise and wind), and the New Qualcomm Chipset for high-definition calls.

4.5 Dual Device Smart Connection

Seamlessly switch between two connected devices, allowing you to stay connected and enjoy uninterrupted audio without the need to manually disconnect and reconnect.

5. Maintenance and Care

Cleaning: Regularly clean the earbuds, ear tips, and charging case with a soft, dry, lint-free cloth. Avoid using harsh chemicals or abrasive materials.
Ear Tips: Remove and clean the silicone ear tips periodically with mild soap and water. Ensure they are completely dry before reattaching.
Storage: When not in use, store the earbuds in their charging case to protect them from dust and damage.
Battery Care: To prolong battery life, avoid exposing the earbuds and charging case to extreme temperatures. Charge them regularly, even if not used frequently.
Water Resistance: The product is not specified as waterproof. Avoid exposure to water or excessive moisture.

6. Troubleshooting

6.1 Pairing Issues

Earbuds not pairing with device: Ensure Bluetooth is enabled on your device and the earbuds are in pairing mode (open the charging case). Try forgetting the device in your Bluetooth settings and re-pairing.
Only one earbud connecting: Place both earbuds back into the charging case, close it, then open it again to reset. Ensure both earbuds have sufficient charge.

6.2 Sound Issues

No sound or low volume: Check the volume levels on both your device and the earbuds. Ensure earbuds are properly seated in your ears for a good seal.
Distorted sound: Move closer to your connected device to avoid interference. Check for any obstructions between the earbuds and your device.

6.3 Charging Issues

Earbuds not charging: Ensure the charging contacts on the earbuds and inside the case are clean and free of debris. Verify the charging cable and power adapter are working correctly.
Charging case not charging: Try a different Type-C cable and power adapter.

6.4 Active Noise Cancellation (ANC) Performance

ANC not effective: Ensure the earbuds are properly seated in your ears with a good seal. The noise cancellation effect may vary due to ear shape, ear tip size, wearing status, and environmental noise.

7. Specifications

Feature	Specification
Brand	KZ
Model	Krio
Bluetooth Version	5.3
Communication	Wireless
Wireless Type	Bluetooth
Codecs	SBC, AAC, LDAC, Apt-X, APTX ADAPTIVE
Vocalism Principle	Dynamic
Active Noise-Cancellation	Yes (6-Mic Hybrid ANC, -55dB Deep Noise Cancellation)
Call Noise Cancellation	CVC Omnidirectional Call Noise Cancellation
Control Button	Yes
Volume Control	Yes
Earphone Playing Time	≈8 hours
Total Battery Life (with case)	≈32 hours
Earhooks Battery Capacity	40mAh
Charging Case Battery Capacity	300mAh
Charging Interface	Type-C
Bluetooth Range	≈15 meters
Latency	55ms Ultra-Low Latency
Material	Plastic
Certification	CE
Origin	Mainland China

Note: All above data are measured by KZ laboratory, and may vary slightly depending on the specific situation and testing environments.

Product Information Table from Manufacturer — Manufacturer's product information table detailing brand, model, protocols, battery life, charging interface, Bluetooth version, total battery life, charging case capacity, and Bluetooth range.

Harman Signature Graph for KZ Krio — Frequency response graph showing the KZ Krio's performance against the Harman Signature, indicating precise recreation of high-quality sound. Data is from KZ laboratory and may vary.

Ultra-Low Distortion Graph for KZ Krio — Distortion graph demonstrating the KZ Krio's ultra-low distortion performance, restoring the pure essence of sound. Data is from KZ laboratory testing and may vary.

Comparison Table: KZ Krio vs. Ordinary Bluetooth TWS — A comparison table highlighting the advantages of KZ Krio over ordinary Bluetooth TWS earbuds, covering aspects like driver type, noise cancellation, phone call quality, tuning, latency, transmission protocol, battery life, and Bluetooth version.

8. Warranty and Support

8.1 Free Returns

Enjoy free returns within 90 days of purchase. Please refer to the seller's return policy for detailed terms and conditions.

8.2 Security & Privacy

Your security and privacy are important. We do not share your personal details with any third parties without your consent. Your personal details are kept safe and secure.

8.3 Customer Support

For any questions, technical assistance, or warranty claims, please contact the seller or manufacturer directly through the platform where the product was purchased. Please provide your order number and a detailed description of the issue for prompt support.

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KZ Krio