SPECIFICATIONS CONNECTION Bluetooth Version: v5.3 Operating Range: Up to 10m (32 feet) Built-in Battery: 400mAh Lithium Battery Playback Time: 40H HEADPHONE Speaker Unit: 40mm Hybrid Diaphragm Frequency: 20Hz - 20KHz lmpedance: 32ohm Sensitivity: 100dB MICROPHONE Mic. Type: ENC Omni-Directional Frequency: 100Hz - 10KHz Sensitivity: -42dB CABLE USB Type-C Charging Cable: 50 cm