Drop + THX Panda Wireless Bluetooth Headphones Massdrop Description: Condition: New Opened BoxFeatures:Headphone type: Closed, planar magneticBluetooth wireless technology: 5.0Effective range: Line of sight, approximately 10 m (30 ft)Battery life: 30+ hoursImpedance: 26 ohmsSensitivity: 100 dB @ 1kHz / 1mWIsolation: -40 dBTHD: 94 dB SPL @ 300Hz < 0.1%THX-AAA-0™ Amplifier: -130 dB THD, 2.6 uV A-wt noise, and 10 mW power consumptionFrequency response: 10–50,000 HzDriver unit: 55mm, ribbon planar magneticMicrophones: DualIPX 6 waterproofWeight: