A13 Pro

Chip: Headset Bluetrum 5636C + Cang Bluetrum 5682B
Version: 5.4 [Dual-ear Calling]
Operating Frequency: 2.402-2.480GHz
Transmission Distance: 15M [Unobstructed]
Frequency Response: 20～20000Hz
Battery Type: 300mAh with protection board (3C fast charging battery), earphone battery 30mAh
Charging Time: 1 hour
Earphone Working Time: Approximately 5.5 hours of continuous playback at 100% volume (tested)