Specifications Bluetooth Version: V5.3 Battery Capacity: 600 mAh Charging Time: About 1.5 hours Standby Time: About 100 hours Running Time: About 25 hours Transmission Distance: 10 meters Horn Impedance: 32 Ω ± 15% Frequency Range: 20 Hz – 20 kHz Speaker Size: 40 mm Speaker Sensitivity: 110 dB ± 3 dB Microphone Sensitivity: -42 dB ± 3 dB Rated Input: 5V ⎓ 500 mA Audio Interface: AUX