Description Bluetooth version / chip: v5.0 / Bestechnic BES2300IU. Audio decoding protocol: SBC/AAC. Frequency response: 20Hz~20kHz. Transmission distance: ?10m. Headset battery: 40mAh. Headset working time: 4 hours (music mode). 3 hours (calls mode). Charging case battery: 500mAh. Total working time: About 20 hours. Headset charging time: About 1 hour. Charging case charging time: About 2 hours. Charging case input: DC5V / 0.4A. Sizes: 49.5×42.4×29.6mm. Weight: About 39.5g. Waterproof rating: IPX4. Certification: CE, RoHS, FCC, EAC, TELEC, BQB, UL62368 test report. Feature 1: LED digital display. Feature 2: ENC noise reduction, clear calls. Feature 3: Support fast charge, charge for 10 minutes, use for 1.5 hours.
