JBL Tune 520BT uses the famous JBL Pure Bass sound, the same technology that powers the world's most famous venues. Wirelessly stream high-quality sound from your smartphone without messy cables with the latest Bluetooth technology. Download the free JBL Headphone App to adjust the sound to your taste with EQ (equalizer). Voice instructions in your preferred language guide you through the Tune functions. 520BT.  Perfect JBL wireless headphones for your every day! Specifications: - Manufacturer: JBL - Type: Headphones - Model: JBL Tune 520BT White Bluetooth - Connectivity: Bluetooth - Speakers: 33mm - Number of microphones: 1 - Driver sensitivity: 102 dB SPL@ 1kHz 1mW - Color: White - Frequency (headphones): 20 Hz – 20 kHz - Impedance: 30 ohms - Bluetooth frequency: 2.4 GHz – 2.4835 GHz - Battery charging time: 2 hours - Battery life time: up to 57 hours