This is a brand new, unopened item. If you wish to purchase multiple items, please comment. Please refrain from price negotiations. Features of the ANKER Soundcore Liberty 4 NC A3947N21 White: Ultra-high performance noise canceling certified by SGS. Significantly improved basic performance due to the incorporation of a high-sensitivity sensor, large-diameter driver, and a chamber that enhances sound insulation. Now able to effectively cancel out a wider variety of everyday noises. 【New Technology Ultra Noise Cancelling 3.0】 Not only does the earphone detect and remove external environments and noise, but it also instantly measures the shape of your ear, removing noise that was previously missed. Provides personalized noise canceling for each individual. Up to 50 hours of ultra-long playback The earphones alone can play music for up to 10 hours, and with the charging case, up to 50 hours. 【Quick Charging】 10 minutes of charging provides approximately 4 hours of music playback. Wireless Hi-Res Audio Playback Compatible with high-quality codec LDAC, which can transmit 3 times more information than standard codecs*, allowing for faithful reproduction of the original sound. *When using Bluetooth A2DP SBC (328kbps, 44.1kHz) 【3-in-1 Multifunction Button】 Equipped with a button that combines three functions. You can open the charging case, pair Bluetooth, and reset the earphone connection with this single button.