User Guide for JBL TUNE 235NC True Wireless Earbuds
Quick guide for the JBL TUNE 235NC true wireless earbuds. Learn about key features, technical specifications, battery life, and how to use the JBL Headphones App.
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Click an image to enlargeQuick Guide for JBL TUNE 235NC
The JBL TUNE 235NC are true wireless noise-cancelling earbuds designed for all-day comfort and high-quality audio. This guide provides an overview of the product features, technical specifications, and usage benefits.

Features and Benefits
- JBL Pure Bass Sound: Features 6.0mm drivers enhanced by a stick form factor for deep, pulsing bass.
- Active Noise Cancelling (ANC) with Smart Ambient: Includes ANC to minimize distractions, Ambient Aware to stay connected to surroundings, and TalkThru for quick conversations without removing the earbuds.
- Voice Clarity: Equipped with 4 microphones for clear, hands-free stereo calls. Includes VoiceAware to control mic input routed back to the earbuds.
- Battery Life: Offers up to 40 hours of total battery life (10 hours in earbuds + 30 hours in the charging case) with ANC off. With ANC engaged, provides 8 hours in earbuds plus 24 hours in the case.
- Speed Charge: A 10-minute charge provides 2 hours of playtime.
- Durability: IPX4 water-resistant and sweatproof design.
- JBL Headphones App: Allows for customization of the listening experience, fit testing, and noise control settings.
What's in the Box

- 1 x JBL Tune 235NC headphones
- 1 x Charging case
- 1 x USB Type-C charging cable
- 1 x 3 sizes of eartips
- 1 x Warranty / Warning documentation
- 1 x Quick Start Guide / Safety Sheet
Technical Specifications
- Driver Size: 6 mm / 0.24" Dynamic Driver
- Power Supply: 5V 1A
- Bluetooth Version: 5.2
- Frequency Response: 20 Hz – 20 kHz
- Impedance: 16 ohm
- Sensitivity: 105 dB SPL@1 kHz
- Maximum SPL: 95 dB
- Microphone Sensitivity: -38 dBV/Pa@1 kHz
- Maximum Operation Temperature: 45°C
Manufacturer information
JBL
Practical help
Common problems
Low battery during use
Use the Speed Charge feature: charge for 10 minutes to get 2 hours of playtime.
Need to hear surroundings
Activate Ambient Aware mode via the JBL Headphones App or earbud controls.
Before use
- Ensure the earbuds are fully charged before first use.
- Select the appropriate eartip size from the 3 included options for the best fit.
- Download the JBL Headphones App to customize settings and fit.
- Ensure your device has Bluetooth enabled for pairing.
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Specs in practice
- 40 Hours Battery
- Total playtime combining earbuds (10h) and charging case (30h) with ANC off.
Model compatibility
- Bluetooth 5.2 connectivity.
- Compatible with JBL Headphones App for advanced customization.
Manual page author
Michael Turner
Technical manual editor