BRAND NEW Features & details Active Noise Cancellation & Transparency Mode - Built-in active noise cancellation mode, eliminating maximum 32dB of the ambient noise, isolating external interference, and creating a quiet listening environment. And without taking off the earbuds, you can hear the sound around you by simply switch to Transparency Mode. Comfort & Secure Fit - Ergonomic in-ear design with 3 different sizes of ear tips provide an ideal fit for every type of ear while the ergonomic shape makes them exceptionally comfortable, and also creates a better seal for enhanced noise isolation. Bluetooth 5.2 - Bluetooth 5.2 version, enjoy smoother and clearer music playback or conversations with a stronger and wider connection. Crystal Clear Calls - Take calls anywhere with Baseus Bluetooth earbuds. Plus, enjoy richer tones, clearer vocals, and deeper bass thanks to a 10mm dynamic driver. All wrapped up in a super-compact design. On-The-Go Listening - Enjoy 5 hours of listening from a single charge, and extend it to 24 hours with the compact charging case. For a quick boost of power when you’re on the move. The charging case supports wireless charging and providing a convenient charging way with no strings attached.