JBL Tune 520BT Wireless On-Ear Headphones Bluetooth 5.3 | 57H Battery – Blue JBL Tune 520BT Wireless On-Ear Headphones Bluetooth 5.3 | 57H Battery – Blue Wireless on-ear headphones with JBL Pure Bass sound The JBL Tune 520BT headphones stream powerful JBL Pure Bass sound thanks to the latest 5.3 BT technology. Easy to use, these headphones provide up to 57 hours of pure pleasure and an extra 3 hours of battery with just 5 minutes of charge. Download the free JBL Headphones App and customize your sound through the EQ, while Voice Prompts guide you through the headphones features. Manage calls, sound and volume from the earcup, thanks to the convenient button control. If a call comes in while you are watching a video on another device, the JBL Tune 520BT seamlessly switches to your mobile device, so you never miss a call. Lightweight and comfortable even after hours of listening, the JBL Tune 520BT headphones fold flat in your backpack to follow you everywhere. General Specifications Driver size (mm) : 33 Number of Microphones : 1 Audio Specifications Driver sensitivity at 1kHz/1mW (dB) : 102 dB SPL@ 1kHz 1mWDynamic frequency response range (Hz) : 20 Hz – 20 kHzImpedance (ohms) : 30 Control and Connection Specifications Bluetooth version : 5.3 Bluetooth profiles : HFP 1.7.2, AVRCP 1.6.2, A2DP 1.3.2 Bluetooth frequency : 2.4 GHz – 2.4835 GHz Bluetooth transmitted modulation : GFSK, π/4-DQPSK, 8-DPSK Bluetooth transmitter power : 6 dBm (E.I.R.P) Battery Charging time (hours from empty) : 2 Maximum play time (hours) : 57 Features Charging cable : Yes Foldable : Yes Built-in Microphone : Yes Hands Free Call : Yes JBL Pure Bass Sound : Yes Multi-Point Connection : Yes Voice Aware : Yes Speed charge : Yes Bluetooth : Yes