The Awei T66 Bluetooth 5.3 Earphones TWS Wireless Earbuds Stereo Sports Ear hook Headphones ENC Noise Reduction With Dual HD Mic. Brand Awei T66Bluetooth version 5.3 (Jieli AC6976D8)Supported protocols HSP, HFP, A2DP, AVRCP Battery capacity of earbuds 35mAh*2 (without protection board but IC) Battery capacity of charging case 300mAh (with protective plate) Diameter of horn 13mm Charging time 1h Talk time 5hPlay time 6h (Used with charging case under 80% volume 20h) Standby time 200h Sensitivity 108±3d Speaker Impedance 32Ω Input standard voltage DC 5VFrequency response range 20Hz-20KHzENC Bandwidth 100Hz-3KHz Maximum transmission distance 15m Horn Φ13mm/32Ω Voice prompt supported Multi-point connection unsupported Wearing method semi-in-ear User manual Chinese and English Port Type-C Waterproof rate IPX6ENC noise reduction for dual microphone > -40dB.