Sony Headphone MDR-XB950BT

Audio Format(s) Supported : SBC, AAC, and aptX® codec support, Battery Charging (Approx) : Appox. 4 hours from empty to full, Battery Life (Approx) : Continuous music playback: up to 20 hours; Continuous communications: up to 20 hours; Standby time: up to 200 hours, Battery Type : Built-in Lithium-ion rechargeable battery, Bluetooth® Technology : Bluetooth specification Version 3.0 2.4 GHz band (2.4000 GHz-2.4835 GHz) FHSS, Cord Length (Approx.) : Headphone cable: 47 1/4 in. (1.2 m) micro-USB cable: 19 3/4 in. (50 cm), Design : Headband Headset, Driver Unit : 40 mm, dome type, Effective range via Bluetooth mode: 20 – 20,000 Hz, Frequency Response : 3 – 28,000 Hz (using supplied cord), Headband : Wide, Adjustable, Impedance : 24 ohms at 1 kHz (using supplied cable), Network Transport Protocol : A2DP (Sampling frequency 44.1 kHz) Transmission Range: 20-20,000 Hz Line of sight approx.30 ft (10 m), NFC : One-touch Listening with NFC (Near Field Communications), Noise Level : ON/OFF switch on ear-cup, Plug : Gold-plated stereo mini plug, Power Consumption (in Operation) : 1.5 W, Power Handling Capacity : 1000 mW (using supplied cord), Sensitivity (db) : 102 dB/mW (using supplied cord), Type : Closed, dynamic, Type of Use : Bluetooth/Passive, Weight (Approx.) : 10 oz. (280 g) without cord