Bluetooth version 5.3 Type-C charging port 500mAh battery capacity (3.7V) 40mm horn; 55–60 hours standby CTN Quantity: 40 Pieces CTN Dimensions: CTN 54*48*44 cm 17.3 kg in weight 1. Low latency Bluetooth 5.3 2. A 500mAh charge lasts roughly 20 hours. 3. Complete ear wrapping. Dress comfortably.