Super bass sound Bluetooth headphones of the highest quality that have value more than the price. During running and during exercise, it does not fall out of the ear. Further description below. Bluetooth version: V5.0 + EDR Headphone battery: 45 mAh Charging battery: 350 mAh Bluetooth distance: 10-15 meters Duration: 3-4 hours Standby time: 60 hours Speaker type: titanium composite film Operating voltage: 3.3V-4.2V Sensitivity: 98 + 3dB Transmission range: 2.4 GHz-2.48 GHz Speaker impedance: MM10MM 32Ω Microphone sensitivity: -42Db Charging voltage / current: 5V / 1A Included in the package: 2x Bluetooth earbuds 1x Charging box 1x Charging cable Compatible with all iOS and Android mobile phones and other devices that have built-in Bluetooth.