Chipset: Bes2300  Noise reduction depth: 25-30dB  Support: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6                                                 Bluetooth version: 5.0v  Response Frequency  : 316Hz ± 20%  Speaker size:Φ10mm  Impedance: 16Ω ± 15%  Intelligent degree: 97 ± 1.5dB at 1000Hz at 0.126v  IEC-318   Frequency range: 20Hz-20kHz at 0.126v IEC-318   Effective range:up to 10 meters  Earbud battery capacity: 2*45mAh  Bluetooth work time: up to 4 hours   Bluetooth + ANC work time: up to 3 hours  Charging case battery capacity:750mAh  Earbud charging time:~1 hours   Charging case charging time: ~ 2 hours   Charging port: Type-C USB  Materials : ABS+ PC    MOQ per customized color 2000pcs  Charging case size :62.77x52.99x27.12cm