Utilizing Bluetooth wireless technology and 45 mm large-aperture drivers with rare-earth magnets and copper-clad aluminum wire voice coils, the ATH-M50xBT brings the coveted sonic signature of M50x to a wireless, on-the-go design. Features Wireless, on-the-go design delivers the same critically acclaimed sonic performance as the original ATH-M50x professional studio headphones Touch control provides convenient access to voice assist Mic and button controls built into the earcup allow for easy handling of calls, music playback and volume adjustment Proprietary 45 mm large-aperture drivers deliver exceptional clarity throughout an extended frequency range, with deep, accurate bass response Over-ear design for excellent sound isolation in loud environments Professional-grade earpad and headband material for long-lasting durability and comfort Up to 40 hours of continuous use on a full charge Compatible with aptX and AAC codecs Specifications Type: Closed-back dynamic Driver Diameter: 45 mm Magnet:Rare earth Voice Coil: CCAW (Copper-clad aluminum wire) Frequency Response: 15 - 28,000 Hz Sensitivity: 99 dB/mW Impedance: 38 ohms Battery: DC3.7 V lithium polymer battery Battery Life: Approx. 40 hours continuous use Charging Time: Approx. 7 hours (for 0-100% charge) Depending on environmental conditions Weight: 310 g (10.9 oz), without cable and connector Bluetooth Version: 5.0 Maximum Range: Line of sight - approx. 10 m (33'') Compatible Bluetooth Profiles: A2DP, AVRCP, HFP, HSP Support Codec: Qualcomm aptX, AAC, SBC Accessories Included: 1.0'' (30 cm) USB charging cable, detachable 3.9'' (1.2 m) cable with 3.5 mm (1/8) gold-plated stereo mini-plug (L-shaped), protective pouch WATCH: ATH-M50xBT Overview | Wireless ATH-M50x Headphones from Audio-Technica