Drivers: 57mm * 2 Frequency Response: 20Hz-20KHz Impedance: 16 Total Harmonic Distortion(THD): 0.3%-3%(THD) Sound Pressure Level(SPL): 110dB Audio Resolution: 24Bit@48Khz Bluetooth Music Time: up to 45 Hours Bluetooth Talk Time: up to 40 Hours Standly Time: up to 1625 Hours Fully Charged Time: about 5 Hours Charging Socket: Micro-USB Operating Distance: 10m Bluetooth Profiles: A2DP,AVRCP,HSP,HFP Bluetooth Version: V4.1 Color: Black / White / Red / Blue Package Weight : 450 G / 15.87 Ounces Package Dimensions (L*W*H) : 186*200*85 MM / 7.32*7.87*3.35 Inches Retail Packaging: Yes, General Box Features: - T2+ is softly padded, its ear cup and top are padded with soft foam and comfy leather.What you may not notice is the carefully designed headband. We have adjusted its size,based on Ergonomies ,to fit all head seizes.All we do is to bring you comfort, because you hate ear ache - Our engineers have spent two years in creating the 57mm ultra-big speaker for T2+,trying to bring you the best music experience T2+,delivers varied music range, rich and strong bass,crisp and clear highs. You can also adjust the equalizer to close your favorite music style,either on your device or by pressing both volume buttons on the headset - The latest bluetooth version, bring top speed and power saveing and enhanced transmission, a perfect match for 4G smart phone,perfectly working with most smart phone such as iPhone/Samsung/Blackberry/motorola... - T2+ is not only a bluetooth headset, but also a wired headset.With an attached audio cable, you can still enjoy favorite music when the battery is flat.Also you can share music with your best friend through its line-out audio. - T2+ can last up to 1625 hours in standby mode, 40 hours music playing and 45 hours phone talk. Battery life is not an issue and more. No matter how long your playlist is, They will survive untill you have time to charge them. - FunctionActive Noise Cancelling + Line Input + Line Output + Bluetooth 4.2 + Connect to 2 Mobile Phones + Four Language Tips.