Victory, another masterpiece created by our Bluedio team, adopt PPS 12 exclusive Acoustics Technology, transcendent S/PDIF Optical Transmission, and totally new playing method: touch-and-drag operation as well as specially designed unprecedented 12 drivers, to bring you a totally different sound experience and share you the excitement of honor and glory. and Customer Service information 18-month from the date of purchase ÂEmail Bluedio Customer Service, get answered under 24 hours ÂTo email Bluedio Customer Service: you can click "Your Account" on Amazon, click"Your Orders", find the Bluedio order, click "Contact Seller". ÂSpecifications Bluetooth version: 4.1 Bluetooth operating range: up to 10m (free space) Frequency range: 2.4GHz-2.48GHz Frequency response: 10Hz-22,000Hz Drivers: 50mm*2; 30mm*2; 20mm*8 Impedance: 42 (50mm)*2; 32 (30mm)*2; 32 (20mm)*8 Bluetooth profiles: aptx , aptx-LL , A2DP, AVRCP, HSP, HFP Digital audio decode format: IEC-61973, PCM 24bit@48KHz Optical music time: about 40 hours Bluetooth music/talk time: about 25 hours Standby time: about 1000 hours Charging time: 2.5 hours for full charge Headphones dimensions: 17.6cm*9cm*18.8cm Headphones weight: 446g In the box Bluedio Victory Bluetooth headphones 3.5mm audio cable 6.3mm patch plug User manual Carrying case with a buckle USB charging cable Pouch for cables Optical audio cable with adapter Note The 3.5mm audio jack on both two sides of the headphones are useful; while the S/PDIF input jack is on the right ear cup. The aptx-LL profile is closed by default because iOS and some Android devices don't support it. If necessary, please contact our customer service to download the specified App to open it.