Key Features Manufacturer: Transformers Model: TF‑T01 Bluetooth Version: 5.3 Range: Approx. 8–10 m Frequency: 2.402–2.480 GHz Transducer: 13 mm Frequency Response: 20 Hz – 20 kHz Impedance: 32 Ω Sensitivity: Approx. 109 dB Codecs: AAC Battery Capacity (Earbuds): 33 mAh Battery Capacity (Case): 300 mAh Charging Time: Approx. 1.5 h Operating Time: Approx. 5 h Charging Interface: USB‑C