Product Description: Version : 6.2 + EDR.. -Transmission range : 10M -Frequency range : 20Hz ~ 20kHz.. -Headsets battery : 45mAh/Single headset. -Headsets battery charging case : 400mAh. -Speaker : 10mm.. -Impedance : 32Ω.. -Standby time : 130 hours.. -Charging voltage : DC 5V. -Talk time : About 8 hours. -Wireless 6.2. -Easy to carry.. -Music enjoy. -Stereo H-fi. -Explosive bass. -Comfortable wear. -Touch controls. -Support single Headset using.. Package Include:. 2 x Headset(L/R). 1 x Battery charging case. 1 x USB Charging Cable. 1 x User manual. 4 x Headset boots... WARM PROMPT OF HEADSET CHARGING: Before using the headphones for the first time, it is recommended to put the left and right headphones into the battery charging box until the battery is fully charged.