Product Name: Wireless Headphones Wearing Method: Air Conduction Acoustic Structure: Ring Iron Combination, Closed Charging Method: Type-C bluetooth-compatible Transmission Distance: 12 Meters (without Obstacles) bluetooth-compatible : 5.2, SBC/AAC/Apt-X bluetooth-compatible Protocol: A2DP/AVRCP/HFP/HSP Battery Life: 8h Frequency Range: 20-20KHz Weight: Whole Machine 27g