100% Brand New.4 colors for your choice: Black/ White/ Blue/ RedDrivers: 57mm speaker X 2Transducer type: dynamicBluetooth version: V4.1Frequency range: 2.4GHz-2.48GHzOperating distance: up to 10m (free space)Bluetooth profiles: A2DP、AVRCP、HSP、HFPImpedance: 16ΩFrequency response: 20Hz-20kHzSensitivity: 110dB Distortion:<0.1%(THD)Music playtime: up to 40 hoursTalk time: up to 45 hoursStandby time: up to 1625 hoursCharging time: about 2 hoursOperational temperature: -10 to 50＜C1 x Stereo Headphones