Bluetooth version V5.3 Model hh-933 Transmission distance 10m Horn diameter 52mm Parameter four ohms and five watts Diaphragm number 1 Frequency range is 80-16000 Hz. Sensitivity is 88dB. Charging port type-c Input parameter DC5V-0.5A Battery size 18650 Capacity 600mAh Playback time 80% 6H Charging time is 2.5h. Size and weight 13 * 5.6 * 12.5