Download the free JBL Headphones app and customize your sound with the equalizer.You can also activate Voice Prompts in the app to guide you through the headset's functions.Thanks to the convenient control buttons, you can manage your calls, sound and volume directly on the headphones.With Voice Aware, you can set how much of your own voice you hear during calls.With one press of a button, you can activate your voice assistant on your device.The lightweight construction and soft ear cushions ensure that they remain comfortable even during long hours of listening.And thanks to their folding design, you can easily fold them flat, e.g. in a backpack. They will accompany you everywhere you go.Properties:- Bluetooth 5.3- Bluetooth profiles: HFP 1.7.2, AVRCP 1.6.2, A2DP 1.3.2- Frequency range 20 Hz - 20 kHz- Sensitivity: 102 dB SPL@ 1kHz 1mW- Maximum SPL: 95 dB- Microphone sensitivity: -29 dBV@1kHz/Pa- JBL Pure Bass- Voice assistant support (Siri, Hey Google)- Voice Aware calls- Built-in microphone- Control on headphones- Folding design- Duration on one charge up to 57 h- Battery capacity: 450 mAh- Charging time approx. 2 h- Charging via USB-C- Weight 157gPackage contents:1x Headphones1x USB-C charging cable1x ManualThe JBL Tune 520BT headphones deliver powerful JBL Pure Bass sound along with the latest Bluetooth 5.3 technology. It offers up to 57 hours of pure music entertainment, and thanks to fast charging, they provide up to 3 more hours of battery life after only 5 minutes of charging.