Casti Lindy LH700XW Wireless Active Noise Cancelling Headphones Superior hybrid ANC headphones with Bluetooth connectivity Technical details Specifications Design: Over Ear Driver: 40mm Active Noise Cancellation: 98% reduction of low frequency noise Bluetooth Standard: 5 Bluetooth Chipset: QCC3005 Battery Type: Internal Lithium Polymer Battery Life: 92Hr ANC Only, , 50Hr Wireless Only, 35Hr ANC & Wireless Impedance: 32Ω passive mode / 100Ω ANC mode Sensitivity: (1mW@1kHz ±3dB): 104 ±3db Frequency Response: 20Hz – 20kHz Nominal THD: