Sports Earphone Charging Box HiFi High-Fidelity Sound Effect: Dynamic unit design, excellent audio analysis, and no distortion of details, providing a superior listening experience. Smart Connection: The earphones are taken out of the charging compartment, automatically turn on and pair, and automatically connect to the mobile phone. Bluetooth Version: v5.1. Transmission Distance: Approximately 20m/787.4 inches Music Time: 5-6 hours Call Time: Approximately 4-5 hours Earphone Battery: 40mAh * 2. Charging Case Battery: 2000mAh. Charging Case Input/Output: 5V/1A Charging Case Charging Time: Approximately 2-3 hours. Earphone Charging Time: Approximately 1 hour. # Please refrain from purchasing if you are nervous, seek perfection, or demand high quality.