Plug 3.5mm Dynamic driver 40mm Frequency response 20Hz – 20kHz Impedance 32 Battery lifetime 16hr BT type 4 JBL E45BT on-ear wireless headphones bring the signature sound of JBL right to your ears. The E45BT is one of our most versatile products ever, featuring up to 16 hours of battery life, an innovative, stylish fabric headband and ergonomic. General Specifications Plug 3.5mm Dynamic driver 40mm Frequency response 20Hz – 20kHz Impedance 32 Battery lifetime 16hr BT type 4 Brand JBL SKU JB523EL0IERKGNAFAMZ-27419 Storage Capacity 0 Model E45