KW15

Chip: Bluetrum 5756C
Version: 5.4 [Dual-ear calling]
Operating frequency: 2.402-2.480GHz
Supported protocols: A2DP/AVDTP/AVRCP/RFOMM/HFP/HSP/SPP/HID profiles
Transmission distance: 15M [Accessibility]
Frequency response: 20～20000Hz
Speaker unit: ΦF10 racetrack titanium diaphragm, 32Ω±15%, 7.118±3DB 5mW
Microphone: 2718 silicon microphone -42±3dB + ceramic antenna
Battery Type:  300mAh with protection board (3C fast charging battery), headphone battery 40mAh
Charging Time: 1 hour
Headphone Working Time: Approximately 5-7 hours of continuous playback at 100% volume (tested)