Minimal design for easy carrying: Small and lightweight at only 41.3g including the case. It comes with a strap and can be attached to a bag like an accessory, making it ideal for carrying. Long playback time of up to 28 hours: When the earphones are fully charged, you can play music for up to 9 hours, and when used with the included charging case, you can play music for up to 28 hours. You can also play music for about 2 hours with just 10 minutes of charging. Compatible with full app functions: You can select the sound from 22 types of equalizer presets on the Soundcore app. In addition, you can freely customize the touch operation of the earphones from the app. Clear voice calls: AI transmits the human voice louder while removing surrounding noise, allowing your voice to reach the other party more clearly. *It does not remove ambient noise when listening to music. Package contents: Earphone body, charging case, ear tips (3 types), USB-C & USB-A cable, quick start guide, safety manual, technical compliance mark certified (frequency band 2.4-2.5GHz) A popular model has evolved further: A higher-end model of the popular model Soundcore Liberty Air 2 with further upgraded sound quality and functionality. Equipped with Anker's unique Ultra Noise Cancelling . Two microphones placed on the outside and inside of the earphones detect surrounding sounds and remove noise, delivering the music you want to listen to clearly. Also, just by selecting the environment you are currently in on the app, you can activate the noise canceling that is optimal for that scene.