Speaker Unit10mm BM Balanced armature driver Earbuds Shape: Ergonomic in-ear design Frequency Range20-20000Hz Audio DecodingQualcomm apyX/aac/sbc ImpedanceWoofer 16+Tweeter 4 Sensitivity93db@1kHz/1mW Intelligent Noise ReductionNew Qualcomm CVC8.1 version,provide a HD call Latency Time40ms low latency Charging interfaceType-C Power input:DC 5V Battery capacity3.7V/40mAh (Earbuds) Battery capacity3.7V/400mAh (Charging case) Charging time:about 60 minutes