OVAQUIXI Bone Conduction Headphones Wireless Headphone

Spec: Item Type: Bone Conduction Headphones Material: PC, ABS Weight: Approx. 188g / 6.6oz Bluetooth​ Version: V5.4 Connection Methods: Bluetooth​, 2.4GHz Wireless Wearing Style: Neckband Principle: Bone Conduction Noise Cancellation: AI Smart Call Noise Reduction Built in Memory: 32GB Bluetooth​ Frequency Response: 20Hz - 20KHz Hearing Assistance Frequency Response: F1≤230Hz, F2≥6.5KHz Maximum Output Sound Pressure (OSPL90): ≤120dB High Frequency Average Valve (OSPL): ≤105dB Full Range Sound Gain (High Frequency Average Valve): 32dB Equivalent Input Noise: ≤12dB Harmonic Distortion: ≤1% Battery Type: Li Battery (Built in) Battery Capacity: 230mAh Charging Current: 180mA Charging Time: 2 Hours Working Time: >30 Hours (Hearing Assistance Mode), >20 Hours (Bluetooth​ Mode) Water, Dust Proof: IP56 Rating How to Use: Use immediately after powering on. PackageList: 1 x Bone Conduction Headphones 1 x Instruction Manual 1 x Charging Cable