The JBL Synchros E50BT are over-ear, Bluetooth headphones with ShareMe music sharing. The frequency range covered by the model is 20Hz – 22kHz. With 32 ohms impedance level and 115dB sensitivity, this pair of black headphones produces authentic sound. It features a rechargeable battery for extended use and easy portability. Its echo-cancellation technology ensures clear voice transmission. Additionally, it has an ergonomic headband and leatherette ear cushions for a comfort fit and noise cancellation.