Model：HBQ QI8 TWS ● Wireless Version：V4.2+EDR ● Impedance：φ10MM  32Ω ● Mic Sensitivity：42Db ● Wireless Frequency：2.4GHZ ● Battery Capacity：65MAH/950MAH ● Working Temperature：10-50℃ ● Charging Voltage：DC5V ● Transmission Distance：12M ● Playing Time：5-6 hours ● Charging Time：1-2 hours ● Standby Time：100 hours Features: 1. listening to the song correct, support songs and call, 2. remind call number, the last call back, all intelligent Chinese and English voice prompts, boot,     pair, shut down the phone power will be low voice prompts; 3. Power capacity will show on your Iphone, you can see the power situation anytime, do not worry     about the electricity ,make your life without worry; 4. One to two connections, can be connected to two mobile phones at the same time 5. Bluetooth headset connected to the phone after the shutdown  , and then open the Bluetooth headset     will connect back to the phone  automatically  , more convenient; 6. Intelligent compatibility: support all Bluetooth mobile phone, tablet, notebook, singing it, QQ music,     movies, etc., universal all mobile phone.